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Exploration of the high-order harmonic generation from periodic potentials by Bohmian trajectories J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2021-01-21 Xue-Fei Pan, Bo Li, Tong Qi, Jun Zhang and Xue-Shen Liu
The recombination processes of the electrons in solid are illustrated by solving the time-dependent Schrödinger equation. The results show that the Bohmian trajectories and the time evolution of the electronic probability density agrees very well, which demonstrates that we can use the Bohmian trajectories to investigate the recombination processes of the electrons in solid. We select the region where
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Short-time emission of higher-angular-momentum photons by atomic transitions J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2021-01-21 Meng Lok Lei and Vincent Debierre
The short-time regime of spontaneous light emission by few-electron ions is examined in detail, with a specific emphasis on the angular momentum of the emitted light. It is found that, in general, photons carrying a higher angular momentum are emitted with important probabilities, at short times, in transitions that are not of the electric dipole type. The probability of emission of such photons is
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Quantum secrecy in thermal states III J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2021-01-21 Anne Ghesquière and Benjamin T H Varcoe
In this paper we expanded the security of a central broadcast protocol using thermal states to the case in which the eavesdropper controls the source. Quantum secrecy in a continuous variable central broadcast scheme is guaranteed by the quantum correlations present in thermal states arising from the Hanbury Brown and Twiss effect. This work allows for a method of key exchange in which two parties
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Relaxation effects on the magnetic cross section and fluorescence radiation polarization after 4 d inner-shell photoionization of Ba-like ions J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2021-01-21 Kun Ma and Zhan-Bin Chen
On the basis of the multi-configuration Dirac–Fock method and the density matrix theory treatment of photoionization (PI) dynamics, a systematic investigation for 4 d inner-shell PI of exemplary Ba atom and Ba-like Nd 4+ , Gd 8+ and Yb 14+ ions is performed. Starting from the general framework of the relativistic, the relaxation effects are considered by using a set of relaxed one-electron orbitals
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Evolution and ion kinetics of a XUV-induced nanoplasma in ammonia clusters J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2021-01-21 R Michiels, A C LaForge, M Bohlen, C Callegari, A Clark, A von Conta, M Coreno, M Di Fraia, M Drabbels, P Finetti, M Huppert, V Oliver, O Plekan, K C Prince, S Stranges, H J Wörner and F Stienkemeier
High-intensity extreme ultraviolet (XUV) pulses from a free-electron laser can be used to create a nanoplasma in clusters. In reference Michiels et al (2020 Phys. Chem. Chem. Phys. 22 7828–34) we investigated the formation of excited states in an XUV-induced nanoplasma in ammonia clusters. In the present article we expand our previous study with a detailed analysis of the nanoplasma evolution and ion
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A strong-field approach with realistic wave functions to the above-threshold ionization of Ba + J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2021-01-21 B Böning, P Abele, W Paufler and S Fritzsche
We study the above-threshold ionization of atoms in intense circularly polarized laser pulses. In order to compute photoelectron energy spectra, we apply the strong-field approximation with different models for the initial state wave function. Specifically, we compare the spectra for singly ionized Barium (Ba + ) using hydrogenic wave functions and realistic one-particle wave functions obtained by
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Identifications of extreme ultraviolet spectra of Br-like to Ni-like neodymium ions using an electron beam ion trap J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2021-01-16 C Suzuki, Dipti, Y Yang, A Gall, R Silwal, S Sanders, A Naing, J Tan, E Takacs and Yu Ralchenko
Accurate extreme ultraviolet spectra of open N -shell neodymium (Nd) ions were recorded at the electron beam ion trap facility of the National Institute of Standards and Technology. The measurements were performed for nominal electron beam energies in the range of 0.90 keV to 2.31 keV. The measured spectra were then compared with the spectra simulated by a collisional-radiative model utilizing atomic
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Argon 1 s −2 Auger hypersatellites J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-31 Ralph Püttner, Yongjun Li, Jiaolong Zeng, Dimitris Koulentianos, Tatiana Marchenko, Renaud Guillemin, Loïc Journel, Oksana Travnikova, Moustafa Zmerli, Denis Céolin, Yoshiro Azuma, Satoshi Kosugi, Maria Novella Piancastelli and Marc Simon
The 1 s −2 Auger hypersatellite spectrum of argon is studied experimentally and theoretically. In total, three transitions to the final states 1 s −1 2 p −2 ( 2 S e , 2 D e ) and 1 s −1 2 s −1 ( 1 S )2 p −1 ( 2 P o ) are experimentally observed. The lifetime broadening of the 1 s −2 → 1 s −1 2 p −2 ( 2 S e , 2 D e ) states is determined to be 2.1(4) eV. For the used photon energy of hν = 7500 eV a
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Theoretical study of electron impact single ionization of neon by multicenter three distorted-wave method at low projectile energy: an overall agreement with experiment J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-22 Maomao Gong, Zhenpeng Wang, Xingyu Li, Song Bin Zhang and Xiangjun Chen
Universal theoretical description of electron impact single ionization process for complex atoms and molecules is a long-standing challenge. A perturbative approach named multicenter three distorted wave method (MCTDW) has recently been developed by our group, aiming at calculating ( e , 2 e ) fully differential cross sections for molecular target. In MCTDW method, the incident, scattered and ejected
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Imaging multiphoton ionization dynamics of CH 3 I at a high repetition rate XUV free-electron laser J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-22 Yu-Chen Cheng, Bart Oostenrijk, Jan Lahl, Sylvain Maclot, Sven Augustin, Georg Schmid, Kirsten Schnorr, Severin Meister, Dimitrios Rompotis, Bastian Manschwetus, Harald Redlin, Cédric Bomme, Benjamin Erk, Daniel Rolles, Rebecca Boll, Pavel Olshin, Artem Rudenko, Michael Meyer, Per Johnsson, Robert Moshammer and Mathieu Gisselbrecht
XUV multiphoton ionization of molecules is commonly used in free-electron laser experiments to study charge transfer dynamics. However, molecular dissociation and electron dynamics, such as multiple photon absorption, Auger decay, and charge transfer, often happen on competing time scales, and the contributions of individual processes can be difficult to unravel. We experimentally investigate the Coulomb
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Bichromatically-controlled entanglement between asymmetric quantum dots in a photonic cavity J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-22 M A Antón, I Gonzalo and F Carreño
Entanglement generation and control of two spatially separated asymmetric quantum dots with broken inversion symmetry and mediated by a photonic cavity is studied using a quantum master equation formalism. The quantum dots are coherently driven by a bichromatic laser consisting of a strong optical field nearly resonant with the optical transition of each quantum dot, and a low frequency field. The
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A modified practical homodyne detector model for continuous-variable quantum key distribution: detailed security analysis and improvement by the phase-sensitive amplifier J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-22 Yundi Huang, Yichen Zhang, Bingjie Xu, Luyu Huang and Song Yu
The practical homodyne detector model of continuous-variable quantum key distribution models the inherent imperfections of the practical homodyne detector, namely the limited detection efficiency and the electronic noise, into trusted loss. However, the conventional practical homodyne detector model is valid only when both the imperfections of the practical homodyne detector are calibrated. In this
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Calculation of the single differential cross section for electron-impact ionization of atoms and molecules J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-22 N A Mori, R Utamuratov, D V Fursa, M C Zammit and I Bray
A technique has been developed for calculating the electron-impact ionization single differential cross section directly from the integrated cross sections of positive-energy pseudostates occuring in close-coupling methods. Using the cross sections arising in the convergent close-coupling method, the approach is first tested against the existing benchmark theoretical and experimental data for electron
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Absorption spectroscopy and Stokes polarimetry in a 87 Rb vapour in the Voigt geometry with a 1.5 T external magnetic field J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-22 Francisco S Ponciano-Ojeda, Fraser D Logue and Ifan G Hughes
This paper provides details of a spectroscopic investigation of a thermal 87 Rb atomic vapour. The experiment was conducted with an external magnetic field of 1.5 T in the Voigt geometry. Very good quantitative agreement between experimental data and theory is found for all four Stokes parameters—with RMS errors of ∼1.5% in all cases. From the fits to our experimental data a value for the magnetic
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Ultrafast dynamics of 2-thiouracil investigated by time-resolved Auger spectroscopy J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-22 F Lever, D Mayer, D Picconi, J Metje, S Alisauskas, F Calegari, S Düsterer, C Ehlert, R Feifel, M Niebuhr, B Manschwetus, M Kuhlmann, T Mazza, M S Robinson, R J Squibb, A Trabattoni, M Wallner, P Saalfrank, T J A Wolf and M Gühr
We present time-resolved ultraviolet-pump x-ray probe Auger spectra of 2-thiouracil. An ultraviolet induced shift towards higher kinetic energies is observed in the sulfur 2p Auger decay. The difference Auger spectra of pumped and unpumped molecules exhibit ultrafast dynamics in the shift amplitude, in which three phases can be recognized. In the first 100 fs, a shift towards higher kinetic energies
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Electron impact single ionization of hydrogen molecule by twisted electron beam J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-22 Nikita Dhankhar and R Choubisa
In this communication, we present the results of the five-fold differential cross-section (5DCS) and triple differential cross-section (TDCS) for the (e, 2e) process on molecular hydrogen (H 2 ) by the plane wave and the twisted electron beam impact. The formalism is developed within the first Born approximation using the plane wave and the twisted wave for the incident electron beam. We describe the
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A superconducting Fabry–Perot cavity for trapping cold molecules J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-22 Fatemeh S Tahsildaran F, Manish Vashishta, Amir Hossein Farahbod, Rasoul Malekfar, Pavle Djuricanin, Katsunari Enomoto and Takamasa Momose
A superconducting Fabry–Perot microwave cavity for a molecular trap was designed, constructed and characterized. The cavity was designed to create intense microwave fields that are sufficient to trap cold polar molecules by the AC Stark force. By coating the mirror surfaces with a superconducting material, an unloaded quality factor of up to 1.1 × 10 6 at 24.087 GHz was achieved at a temperature of
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Rydberg transitions and photoionisation cross section of NH 3 J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-22 Paresh Modak and Bobby Antony
Partial photoionisation cross sections of NH 3 are calculated for processes involving transitions from the ground state to 2 A 1 and 2 E excited electronic states of the neutral target and residual ion respectively for a wide range of wavelengths using the R -matrix method. Some near threshold structures are resolved. A comparative study is reported for the lone pair 3 a 1 electrons with the isoelectronic
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Dynamics of a qubit-oscillator system with periodically varying coupling J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-16 Mirko Amico and Roman Ya Kezerashvili
The dynamics of qubits coupled to a harmonic oscillator with time-periodic coupling is investigated in the framework of Floquet theory. This system can be used to model nonadiabatic phenomena that require a periodic modulation of the qubit/oscillator coupling. The case of a single qubit coupled to a resonator populated with n = 0, 1 photon is explicitly treated. The time-dependent Schrödinger equation
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Localized dynamics following a quantum quench in a non-integrable system: an example on the sawtooth ladder J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-09 Rishabh Khare and Sayan Choudhury
Motivated by the recent discovery of ergodicity breaking in geometrically frustrated systems, we study the quench dynamics of interacting hardcore bosons on a sawtooth ladder. We identify a set of initial states for which this system exhibits characteristic signatures of localization like initial state memory retention and slow growth of entanglement entropy for a wide parameter regime. Remarkably
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From synchrotrons for XFELs: the soft x-ray near-edge spectrum of the ESCA molecule J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-09 S L Sorensen, X Zheng, S H Southworth, M Patanen, E Kokkonen, B Oostenrijk, O Travnikova, T Marchenko, M Simon, C Bostedt, G Doumy, L Cheng and L Young
A predictive understanding of soft x-ray near-edge absorption spectra of small molecules is an enduring theoretical challenge and of current interest for x-ray probes of molecular dynamics. We report the experimental absorption spectrum for the electron spectroscopy for chemical analysis (ESCA) molecule (ethyl trifluoroacetate) near the carbon 1s absorption edge between 285–300 eV. The ESCA molecule
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Structure, reactions, and electronic spectra of the rare gas cyanohydrides and isocyanohydrides, HRgCN and HRgNC (Rg = Xe or Rn) J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-09 Miriam D van Hoeve and Mariusz Klobukowski
The low-energy electronic excitations of HRgCN and HRgNC (Rg = Xe, Rn) were computed at the TDDFT level of theory, both in the gas phase and in xenon cluster. It was found that the most prominent peak in the spectra was due to the highest occupied molecular orbital (HOMO) to lowest unoccupied molecular orbital (LUMO) transition (∼6 eV for HRgCN and ∼4.5 eV for HRgNC). Cluster confinement brought about
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Evidence of ultrafast dissociation in the CHCl 3 molecule J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-09 A C F Santos, D N Vasconcelos, M A MacDonald, M M Sant’Anna, B N C Tenório, A B Rocha, V Morcelle, V S Bonfim, N Appathurai and L Zuin
In the present work, we use tunable synchrotron radiation to investigate experimentally and theoretically the dissociation of a chlorinated methane, the CHCl 3 molecule, by exciting a chlorine 2 p core electron into the LUMO and LUMO + 1 orbitals. The Auger electron energy distribution measured at the Cl 2p 3/2 → 10a 1 resonance shows narrow lines which energies correspond to the Cl * → Cl + atomic
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Numerical study of evaporative cooling in the space station J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-09 Bo Fan, Luheng Zhao, Yin Zhang, Jingxin Sun, Wei Xiong, Jinqiang Chen and Xuzong Chen
In this paper, we numerically studied the effects of mechanical vibration and magnetic fields on evaporative cooling process carried in space station by direct simulation Monte Carlo method. Simulated with the vibration data of international space station, we found that the cooling process would suffer great atomic losses until the accelerations reduced tenfold at least. In addition, if we enlarge
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Coherence properties of highly-excited motional states of a trapped ion J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-09 V Jarlaud, P Hrmo, M K Joshi and R C Thompson
We present a study of the coherence properties of a variety of motional states of a single ion confined in a Penning ion trap. We demonstrate that the motion of the ion has a coherence time of the order of 1 s, using Ramsey interferometry. We introduce a technique for preparing the ion in an incoherent superposition of highly-excited motional states using a simple modification of optical sideband cooling
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New investigation of the electron-impact ionization of the intermediate valence state of ammonia J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-12-09 R El Mir, K Kaja, A Naja, E M Staicu Casagrande, S Houamer and C Dal Cappello
We report on the measurement of the triply differential cross-section for electron-impact ionization of the valence 1e orbitals of ammonia using the (e, 2e) technique with coplanar asymmetric kinematics. The experimental results are first compared to the theoretical cross sections calculated using the 1CW, 1DW and the BBK models recently extended to molecules. We then introduce the short-range (SR)
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Resonant x-ray absorption of strong-field-ionized CF 3 Br J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-28 A E A Fouda, P J Ho, R W Dunford, E P Kanter, B Krässig, L Young, E R Peterson, E C Landahl, L Pan, D R Beck and S H Southworth
We report on an experimental and theoretical study of strong-field laser ionization of CF 3 Br followed by resonant x-ray absorption at the Br K -edge. Distinct 1s → 4p, 5p Rydberg transitions of Br q + ( q = 1–4) atomic ions are observed and identified with Hartree–Fock–Slater and relativistic configuration interaction calculations. Time-dependent density functional theory and ab initio molecular
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Auger electron wave packet interferometry on extreme timescales with coherent soft x-rays J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-27 Sergey Usenko, David Schwickert, Andreas Przystawik, Karolin Baev, Ivan Baev, Markus Braune, Lars Bocklage, Marie Kristin Czwalinna, Sascha Deinert, Stefan Düsterer, Andreas Hans, Gregor Hartmann, Christian Haunhorst, Marion Kuhlmann, Steffen Palutke, Ralf Röhlsberger, Juliane Rönsch-Schulenburg, Philipp Schmidt, Slawomir Skruszewicz, Sven Toleikis, Jens Viefhaus, Michael Martins, André Knie, Detlef
Wave packet interferometry provides benchmark information on light-induced electronic quantum states by monitoring their relative amplitudes and phases during coherent excitation, propagation, and decay. The relative phase control of soft x-ray pulse replicas on the single-digit attosecond timescale achieved in our experiments makes this method a powerful tool to probe ultrafast quantum phenomena such
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Time-resolved quantum beats in the fluorescence of helium resonantly excited by XUV radiation J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-27 A C LaForge, A Benediktovitch, V Sukharnikov, Š Krušič, M Žitnik, M Debatin, R W Falcone, J D Asmussen, M Mudrich, R Michiels, F Stienkemeier, L Badano, C Callegari, M Di Fraia, M Ferianis, L Giannessi, O Plekan, K C Prince, C Spezzani, N Rohringer and N Berrah
We report on the observation of time-resolved quantum beats in the helium fluorescence from the transition 1 s 3 p → 1 s 2 s , where the initial state is excited by XUV free electron laser radiation. The quantum beats originate from the Zeeman splitting of the magnetic substates due to an external magnetic field. We perform a systematic study of this effect and discuss the possibilities of studying
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Single photon simultaneous K-shell ionization/excitation in C 6 H 6 : experiment and theory J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-26 S Carniato, P Selles, A Ferté, N Berrah, A H Wuosmaa, M Nakano, Y Hikosaka, K Ito, M Žitnik, K Bučar, K Soejima, K Jänkälä, D Cubaynes, J-M Bizau, L Andric, M A Khalal, J Palaudoux, P Lablanquie and F Penent
Single photon simultaneous core ionization/core excitation (K −2 V) of the Benzene molecule has been observed experimentally, using synchrotron radiation, by electron coincidence spectroscopy with a magnetic bottle time-of-flight electron spectrometer and reveals a rich spectrum. DFT and Post–Hartree–Fock calculations provide detailed assignments of K −2 V states. The specific Auger decay of these
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Inner shell photofragmentation of 2Cl-pyrimidine studied by mass spectrometry and electron–ion coincidence experiments J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-25 Paola Bolognesi, Antti Kettunen, Patrick O’Keeffe, Robert Richter, Antonella Cartoni, Anna Rita Casavola, Mattea C Castrovilli, Sanja Tosic, Bratislav P Marinkovic and Lorenzo Avaldi
Photoelectron spectroscopy, mass spectrometry and electron–ion coincidence experiments combined with tunable synchrotron radiation have been used to study the decay and fragmentation of 2Cl-pyrimidine after Cl(2p), C(1s) and N(1s) excitations. The goal is to investigate how the state- and site-selected excitation and the chemical environment affect the fragmentation paths of the molecule and to make
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Modulational instability in a one-dimensional spin–orbit coupled Bose–Bose mixture J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-25 Dheerendra Singh, Mithilesh K Parit, Thokala Soloman Raju and Prasanta K Panigrahi
We establish the condition of modulational instability (MI) in one-dimensional effective one-component self-bound quantum droplets and Bose–Bose (BB) mixture, coupled through spin–orbit and Rabi couplings. For the self-bound quantum droplets of effective one-component BB mixture, MI occurs for the atom density: ##IMG## [http://ej.iop.org/images/0953-4075/53/24/245001/babc3d2ieqn1.gif] {$P{< }{\lef
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High intensity x-ray interaction with a model bio-molecule system: double-core-hole states and fragmentation of formamide J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-25 D Koulentianos, A E A Fouda, S H Southworth, J D Bozek, J Küpper, R Santra, N V Kryzhevoi, L S Cederbaum, C Bostedt, M Messerschmidt, N Berrah, L Fang, B Murphy, T Osipov, J P Cryan, J Glownia, S Ghimire, P J Ho, B Krässig, D Ray, Y Li, E P Kanter, L Young and G Doumy
Formamide, a simple model bio-molecule (HCONH 2 ), is irradiated with high intensity, ultrashort pulses from an x-ray free electron laser. Ionic fragments resulting from photoionization and subsequent decay processes are recorded, as well as the electronic signature of the different inner shell ionization events that can take place during the x-ray pulses. The formation of double-core-hole states,
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Photoelectron spectra and angular distribution in sequential two-photon double ionization in the region of autoionizing resonances of ArII and KrII J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-24 M D Kiselev, P A Carpeggiani, E V Gryzlova, S M Burkov, M Reduzzi, A Dubrouil, D Faccialá, M Negro, K Ueda, F Frassetto, F Stienkemeier, Y Ovcharenko, M Meyer, M Di Fraia, O Plekan, K C Prince, C Callegari, G Sansone and A N Grum-Grzhimailo
Autoionizing hole states with electron configuration n s n p 5 m p are studied in Ar + and Kr + . Total and partial photoionization cross sections, photoelectron spectra and photoelectron angular distributions in the region of the resonances are obtained theoretically in extensive R -matrix calculations. The states of Ar + are observed by means of excitation by a free-electron laser operating in the
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Femtosecond fragmentation of CS 2 after sulfur 1s ionization: interplay between Auger cascade decay, charge delocalization, and nuclear motion J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-24 O Grånäs, A Mocellin, E S Cardoso, F Burmeister, C Caleman, O Björneholm and A Naves de Brito
We present a combined experimental and theoretical study of the fragmentation of molecular CS 2 after sulfur 1s Auger cascade decay, consisting of electron–multi-ion coincidence spectra of charged fragments and theoretical simulations combining density functional theory and molecular dynamics. On the experimental side, a procedure for a complete determination of all sets of ions formed is described
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Single-mode nonclassicality criteria via Holstein–Primakoff transformation J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-21 Mehmet Emre Tasgin
We study different representations of a many-particle system. We reveal the connections among the nonclassicalities of many-particle, single-mode and two-mode systems in the infinite particle number limit. First, we demonstrate that (separable) atomic coherent states, of a many-particle system, mimic the coherent states of single-mode light as the number of particles goes to infinity. This enables
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Mechanisms and dynamics of the NH + 2 + H + and NH + + H + + H fragmentation channels upon single-photon double ionization of NH 3 J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-21 Kirk A Larsen, Thomas N Rescigno, Zachary L Streeter, Wael Iskandar, Saijoscha Heck, Averell Gatton, Elio G Champenois, Travis Severt, Richard Strom, Bethany Jochim, Dylan Reedy, Demitri Call, Robert Moshammer, Reinhard Dörner, Allen L Landers, Joshua B Williams, C William McCurdy, Robert R Lucchese, Itzik Ben-Itzhak, Daniel S Slaughter and Thorsten Weber
We present state-selective measurements on the ##IMG## [http://ej.iop.org/images/0953-4075/53/24/244003/babc3aaieqn2.gif] {${\mathrm{N}\mathrm{H}}_{2}^{+}$} + H + and NH + + H + + H dissociation channels following single-photon double ionization at 61.5 eV of neutral NH 3 , where the two photoelectrons and two cations are measured in coincidence using 3D momentum imaging. Three dication electronic
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Sensitive detection of metastable NO and N 2 by reactive collisions with laser-excited Li J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-21 Jiwen Guan, Tobias Sixt, Katrin Dulitz and Frank Stienkemeier
In a proof-of-principle experiment, we demonstrate that metastable nitric oxide molecules, NO(a 4 Π i ), generated inside a pulsed, supersonic beam, can be detected by reactive gas-phase collisions with electronically excited Li atoms in the 2 2 P 3/2 state. Since the internal energy of NO(a 4 Π i , v ⩽ 4) is lower than the ionization potential of Li in the 2 2 S 1/2 electronic ground state, we observe
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Study of the effect of super-atom dephasing on Rydberg blockade in thermal vapor J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-21 Dushmanta Kara and Ashok K Mohapatra
We present a theoretical model with a large number of interacting atoms that can be used to study the Rydberg blockade in thermal vapor. Exact calculations for two, three and four interacting atoms are extrapolated to formulate the model for N interacting atoms using the method of induction. The effect of the decay mechanisms such as the laser frequency noise and the super-atom dephasing arising due
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X-ray scattering signatures of early-time accelerations in iodine dissociation J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-20 Ian Gabalski, Matthew R Ware and Philip H Bucksbaum
Ultrafast time-resolved x-ray scattering (TRXS) from a photoexcited molecular ensemble measures a distribution S ( Q , τ ) of the x-ray momentum transfer Q and pump-probe delay τ in which all modes of motion induced by the excitation overlap. Frequency-resolved x-ray scattering (FRXS) based on ##IMG## [http://ej.iop.org/images/0953-4075/53/24/244002/babc22aieqn1.gif] {$\tilde {S}\left(Q,\omega \right)$}
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Electron–ion coincidence spectroscopy of a large organic molecule: photofragmentation of avobenzone after valence and core ionisation J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-20 Abdul Rahman Abid, Eetu Pelimanni, Maximilian Reinhardt, Nacer Boudjemia, Antti Kivimäki, Marko Huttula, Olle Björneholm and Minna Patanen
The Avobenzone (AVOB) molecule is very photoactive and undergoes irreversible degradation upon irradiation. We studied its valence and core-level (C1 s and O1 s ) photoionisation and subsequent photofragmentation with photoelectron spectroscopy and photoelectron–photoion–photoion coincidence (PEPIPICO) spectroscopy. AVOB is one of the largest molecules studied with this technique. The results show
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Advances in ultrafast gas-phase x-ray scattering J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-13 Brian Stankus, Haiwang Yong, Jennifer Ruddock, Lingyu Ma, Andres Moreno Carrascosa, Nathan Goff, Sébastien Boutet, Xuan Xu, Nikola Zotev, Adam Kirrander, Michael P Minitti and Peter M Weber
Recent developments of x-ray free electron lasers and pulsed electron sources have enabled ultrafast scattering to become an increasingly powerful tool for exploring molecular dynamics. This article describes our recent experimental and methodological advances in ultrafast gas-phase x-ray scattering experiments at the LCLS. A re-designed short-pathlength windowless diffractometer is coupled with careful
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Asymptotic behavior of correlation functions of one-dimensional polar-molecules on optical lattices J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-13 Theja N De Silva
We combine a slave-spin approach with a mean-field theory to develop an approximate theoretical scheme to study the density, spin, and, pairing correlation functions of fermionic polar molecules. We model the polar molecules subjected to a one-dimensional periodic optical lattice potential using a generalized t – J model, where the long-range part of the interaction is included through the exchange
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Evading thermal population influence on enantiomeric-specific state transfer based on a cyclic three-level system via ro-vibrational transitions J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-13 Quansheng Zhang, Yu-Yuan Chen, Chong Ye and Yong Li
Optical methods of enantiomeric-specific state transfer had been proposed theoretically based on a cyclic three-level system of chiral molecules. According to these theoretical methods, recently the breakthrough progress has been reported in experiments (Eibenberger et al 2017 Phys. Rev. Lett. 118 123002; Pérez et al 2017 Angew. Chem. Int. Ed. 56 12512) for cold gaseous chiral molecules but with achieving
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Effects of finite momentum width on the reversal dynamics in a BEC based atom optics δ -kicked rotor J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-11 Jay Mangaonkar, Chetan Vishwakarma, S Sagar Maurya, Sumit Sarkar, Jamie L MacLennan, Pranab Dutta and Umakant D Rapol
This experimental work demonstrates the importance of finite-width effects in the evolution of a quantum system, where the results deviate considerably from the plane wave approximation even for an initial state with a very narrow momentum width i.e a Bose–Einstein condensate. The system under consideration is an atom optics δ -kicked rotor for which a fidelity based measurement has been proposed to
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Spectroscopic proprieties of the ground and the higher excited states of the KCs J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-11 Héla Habli, Leila Mejrissi, Soulef Jellali and Brahim Oujia
Potential energy curves, spectroscopic parameters, electric dipole moments (PEDM and TEDM) and vibrational levels’ spacing for 14 1 Σ + , 13 3 Σ + , 8 1,3 Π, and 3 1,3 Δ electronic states, including the ionic limit K − Cs + , are highly computed and presented in adiabatic representation. These properties are determined by the use of an ab initio method involving non-empirical pseudo-potentials, the
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Double differential distributions of e-emission in ionization of N 2 by 3, 4 and 5 keV electron impact J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-11 Madhusree Roy Chowdhury, Dhaval Chauhan, Chetan G Limbachiya, Karoly Tőkési, Christophe Champion, Philippe F Weck and Lokesh C Tribedi
We report the measurement of the absolute double differential cross sections (DDCS) of secondary electrons emitted due to the ionization of N 2 molecule in collisions with fast electrons having energies between 3 and 5 keV. The emitted electrons with energies from 1–500 eV have been measured for different forward and backward emission angles. The measured DDCS have been compared with the state-of-the-art
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Analysis of Compton profile through information theory in H-like atoms inside impenetrable sphere J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-10 Neetik Mukherjee and Amlan K Roy
Confinement of atoms inside various cavities has been studied for nearly eight decades. However, the Compton profile (CP) for such systems has not yet been investigated. Here we construct the CP for a H atom radially confined inside a hard spherical enclosure, as well as in a free condition . Some exact analytical relations for the CP’s of circular or nodeless states of free atoms is presented. By
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Mesoscopic entanglement through central–potential interactions J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-10 Sofia Qvarfort, Sougato Bose and Alessio Serafini
The generation and detection of entanglement between mesoscopic systems would have major fundamental and applicative implications. In this work, we demonstrate the utility of continuous variable tools to evaluate the Gaussian entanglement arising between two homogeneous levitated nanobeads interacting through a central potential. We compute the entanglement for the steady state and determine the measurement
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Bright, polarization-tunable high repetition rate extreme ultraviolet beamline for coincidence electron–ion imaging J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-10 A Comby, E Bloch, S Beauvarlet, D Rajak, S Beaulieu, D Descamps, A Gonzalez, F Guichard, S Petit, Y Zaouter, V Blanchet and Y Mairesse
After decades of supremacy of the Titanium:Sapphire technology, Ytterbium-based high-order harmonic sources are emerging as a promising alternative for experiments requiring high flux of ultrashort extreme ultraviolet (XUV) radiation. In this article we describe a versatile experimental setup delivering XUV photons in the 10–50 eV range. The use of cascaded high-order harmonic generation enables us
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The role of anchoring groups in ruthenium(II)-bipyridine sensitized p-type semiconductor solar cells—a quantum chemical approach J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-10 Anik Sen, Stephan Kupfer, Stefanie Gräfe and Axel Groβ
Ru(II)-bipyridine complexes connected with p-type semiconductors (p-SCs) are promising systems for photocatalytic applications such as in dye-sensitised solar cells. The photosensitizer-semiconductor interface—governed by the anchoring group—is of vital importance for the electronic properties of the systems as it determines the long-term stability to the semiconductor surface through its binding ability
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Pulse length effects on autoionizing states under the influence of intense SASE XUV fields J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-10 L Aufleger, P Friebel, P Rupprecht, A Magunia, T Ding, M Rebholz, M Hartmann, V Stooß, C Ott and T Pfeifer
The Fano absorption line shape of an autoionizing state encodes information on its internal atomic structure and dynamics. When driven near-resonantly with intense extreme ultraviolet (XUV) electric fields, the absorption profile can be deliberately modified, including observable changes of both the line-shape asymmetry and strength of the resonance, revealing information on the underlying dynamics
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Ionization of an atom with different initial angular momenta in an intense circular polarized laser field J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-11-05 Dan Wu, Fu-Ming Guo, Ji-Gen Chen, Jun Wang and Yu-Jun Yang
We theoretically investigate the ionization process of the interaction between a strong circular polarized laser pulse and an atom, whose initial state has different orbital angular momenta. When the rotation direction of the laser vector field is opposite to that of the bound state, the ionization probability is significantly higher than the co-rotating case, in which the laser vector field is in
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Projectile angular distribution for electron capture in p + H 2 collision considering the vibrational motion J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-10-23 A Igarashi
We show the results calculated with improved treatment for the interaction between incident proton and nuclei in H 2 over our previous work [2019 J. Phys. B: At. Mol. Opt. Phys. 52 075204] for electron capture process from H 2 by proton with including the vibrational motion of molecules. Moreover, the differential cross sections with respect to the projectile scattering angle are calculated and the
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Interatomic resonant Auger effect in N 2 O J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-10-23 Sascha Deinert, Alexander Schrodt, Gregor Hartmann, Alexander Achner, Anton N Artemyev, Arno Ehresmann, Andreas Hans, Markus Ilchen, Leif Glaser, Frank Scholz, Jörn Seltmann, Jens Viefhaus, Philipp V Demekhin and André Knie
The interatomic resonant Auger effect in N 2 O is investigated experimentally and theoretically. We observe variations of the ratio between the yields of 1 s -photoionization of the central and terminal nitrogen atom in the photon energy range across the O 1 s → π * excitation. The present ab initio calculations of electronic structure and dynamics attribute these variations to the Fano interference
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Phase matching and quasi-phase matching of high-order harmonic generation—a tutorial J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-10-27 Liran Hareli, Georgiy Shoulga and Alon Bahabad
In this tutorial we discuss the macroscopic aspects of the extreme nonlinear frequency conversion process of high-order harmonic generation. For most, this entails describing the phase mismatch of the process and the means to mitigate it by tuning global parameters or by modulations perturbing the process. Additionally, we consider applications of phase matching in general for probing and for controlling
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Optomechanically tuned Fano resonance and slow light in a quadratically coupled optomechanical system with membranes J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-10-27 Xiao-Yun Wang, Liu-Gang Si, Xiao-Hu Lu and Ying Wu
Realizing and controlling a Fano resonance is of fundamental significance in physics and may find applications in optical switching and sensitivity-enhanced biochemical sensing. Here we present a practicable scheme to realize Fano resonance and slow light in a quadratically coupled optomechanical system with membranes. It is shown that Fano resonance generation is precisely controlled by changing the
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Benchmark calculations of ro-vibrational spectrum of HeH − and its isotopologues J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-10-23 Ewa Palikot, Monika Stanke and Ludwik Adamowicz
Benchmark variational calculations of the Born–Oppenheimer potential energy curve (PEC) performed with explicitly correlated all-electron Gaussian functions with shifted centers are presented. The PEC energies include the leading relativistic and quantum-electrodynamics corrections and the first-order corrections due to adiabatic effects. The PEC is used to calculate the ro-vibrational spectra for
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Novel repumping on 3 P 0 → 3 D 1 for Sr magneto-optical trap and Landé g factor measurement of 3 D 1 J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-10-23 Shengnan Zhang, Preetam Ramchurn, Marco Menchetti, Qasim Ubaid, Jonathan Jones, Kai Bongs and Yeshpal Singh
We realize an experimental facility for cooling and trapping strontium (Sr) atoms and measure the Landé g factor of 3 D 1 of 88 Sr. Thanks to a novel repumping scheme with the 3 P 2 → 3 S 1 and 3 P 0 → 3 D 1 combination and the permanent magnets based self-assembled Zeeman slower, the peak atom number in the continuously repumped blue magneto-optical trap is enhanced by a factor of 15 with respect
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The local Lorentz symmetry violation and Einstein equivalence principle J. Phys. B: At. Mol. Opt. Phys. (IF 1.703) Pub Date : 2020-10-23 Baocheng Zhang
Lorentz symmetry violation (LV) was recently proposed to be testable with a new method, in which the effect of the violation is described as a certain local interaction Shaniv et al (2018 Phys. Rev. Lett. 120 103202). We revisit this LV effect in the paper and show that it is not only local, but it also represents a classical violation according to the recent quantum formulation of the Einstein equivalence