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Simulations of the correlated momentum distributions for nonsequential double ionization of neon in elliptically polarized laser fields J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-26 Zhangjin Chen, Qinghua Chen, Huipeng Kang, Toru Morishita
We use the improved quantitative rescattering (QRS) model to simulate the experimentally measured correlated two-electron momentum distributions (CMDs) for nonsequential double ionization (NSDI) of Ne exposed to intense elliptically polarized laser pulses with a central wavelength of 788 nm at a peak intensity of 5 ×1014 W cm−2 for the ellipticities ranging from 0 to 0.25 (Kang et al 2018 Phys. Rev
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Corrigendum: Exploring the role of beyond mean-field interaction in the structure and dynamics of one-dimensional quantum droplets (2023 J. Phys. B: At. Mol. Opt. Phys. 56 165302) J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-23 Sonali Gangwar, Rajamanickam Ravisankar, Paulsamy Muruganandam, Pankaj Kumar Mishra
In our recent paper (Gangwar et al 2023 J. Phys. B: At. Mol. Opt. Phys. 56 165302), we noticed a minor mistake in equations (1) and (2). In this corrigendum, we provide the corrected equations and necessary modified figures. However, overall results and conclusions of our original paper remain unchanged.
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Production of twisted particles in magnetic fields J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-23 Liping Zou, Pengming Zhang, Alexander J Silenko
The use of a (quasi)uniform magnetic field opens new possibilities for the production of twisted particles having orbital angular momenta. We ascertain these possibilities. Quantum states suitable for the creation of charged particles in a uniform magnetic field are determined. The particle penetration from a solenoid to vacuum or another solenoid is analyzed in detail. It is shown that a previously
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Quantum degeneracy and spin entanglement in ideal quantum gases J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-23 Fatma Zouari Ahmed, Mohammed Tayeb Meftah, Tommaso Roscilde
Quantum degeneracy is the central many-body feature of ideal quantum gases stemming from quantum mechanics. In this work we address its relationship to the most fundamental form of non-classicality in many-body system, i.e. many-body entanglement. We aim at establishing a quantitative link between quantum degeneracy and entanglement in spinful ideal gases, using entanglement witness criteria based
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Critical exponents and fluctuations at BEC in a 2D harmonically trapped ideal gas J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-22 M I Morales-Amador, V Romero-Rochín, R Paredes
The critical properties displayed by an ideal 2D Bose gas trapped in a harmonic potential are determined and characterized in an exact numerical fashion. Beyond thermodynamics, addressed in terms of the global pressure and volume which are the appropriate variables of a fluid confined in a non-uniform harmonic potential, the density-density correlation function is also calculated and the corresponding
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Classical-trajectory model for ionizing proton-ammonia molecule collisions: the role of multiple ionization J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-21 Alba Jorge, Marko Horbatsch, Tom Kirchner
We use an independent electron model with semi-classical approximation to electron dynamics to investigate differential cross sections for electron emission in fast collisions of protons with ammonia molecules. An effective potential model for the electronic orbitals is introduced, and utilized in the context of the classical-trajectory Monte Carlo (CTMC) approach for single-electron dynamics. Cross
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Generalized binary-encounter-Bethe model for electron impact ionization of atoms J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-21 Yuan-Cheng Wang, Li Guang Jiao, Stephan Fritzsche
A generalized binary-encounter-Bethe (GBEB) model is proposed to calculate the partial ionization cross sections of all shells. The present model improves the original version of Kim et al (2000 Phys. Rev.A 62 052710) by incorporating a physically constructed effective charge felt by the ejected electron in the empirical factor, which prevents the selection of specific factors for different shells
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Study of state-selective single-electron capture in slow Ne7+ colliding with He and H2 target J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-14 X B Zhu, D D Xing, K Z Lin, S C Cui, X L Zhu, Y Gao, D L Guo, D M Zhao, S F Zhang, X Ma
Using the cold target recoil-ion momentum spectroscopy, we measured the state-selective single electron capture in collisions of 3.5–6.3 keV u−1 Ne7+ ions and He and H2. The Q-value spectra and angular distributions as a function of the projectile incident energy were obtained. The results show that the single electron capture into n = 4 states is the dominant reaction channel for the Ne7+-He system
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Experimental and theoretical Ritz-Rydberg analysis of the electronic structure ofhighly charged ions of lead and bismuth by optical spectroscopy J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-12 Michael K Rosner, Nils-Holger Rehbehn, José R Crespo López-Urrutia
Abstract Intra-configuration fine-structure transitions in highly charged ions (HCI) result in most cases from changes in the coupling of equivalent electrons. They are multipole forbidden to varying degrees and often occur within the optical range. In HCI with semi-filled nd and nf subshells, electrons can in principle couple to states which are energetically close but with very different total angular
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Two-center resonant photoionization-excitation driven by combined intra- and interatomic electron correlations J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-12 S Kim, S Steinhäuser, A B Voitkiv, C Müller
Ionization-excitation of an atom induced by the absorption of a single photon in the presence of a neighboring atom is studied. The latter is, first, resonantly photoexcited and, afterwards, transfers the excitation energy radiationlessly to the other atom, leading to its ionization with simultaneous excitation. The process relies on the combined effects of interatomic and intraatomic electron correlations
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Propagation properties and stability of dark solitons in weakly interacting Bose–Bose droplets J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-12 Jakub Kopyciński, Buğra Tüzemen, Wojciech Górecki, Krzysztof Pawłowski, Maciej Łebek
We investigate dark solitons in two-component Bose systems with competing interactions in one dimension. Such a system hosts a liquid phase stabilized by the beyond-mean field corrections. Using the generalized Gross–Pitaevskii equation, we reveal the presence of two families of solitonic solutions. The solitons in both of them can be engineered to be arbitrarily wide. One family of solutions, however
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Sub-Doppler laser cooling and magnetic trapping of natural-abundance fermionic potassium J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-09 Mateusz Bocheński, Mariusz Semczuk
We demonstrate the largest number of 40K atoms that has ever been cooled to deeply sub-Doppler temperatures in a single-chamber apparatus without using an enriched source of potassium. With gray molasses cooling on the D 1-line following a standard D 2-line magneto-optical trap, we obtain 3×105 atoms at 10(2) µK. We reach densities high enough to measure the temperature via absorption imaging using
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Energy and angular distributions in 250 eV electron and positron collisions with argon atom J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-07 K Tőkési, R D DuBois
We present energy and angular differential cross sections for single-ionization in collisions between electrons and positrons with argon atoms at 250 eV. We treat the collision classically using the three body approximation where the target atoms are described within the single active electron approximation using a Garvey model potential and only the outermost electron is involved in the collision
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Statistical RTA simulations of atomic data for astrophysical opacity modeling in the context of kilonova emission J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-07 H Carvajal Gallego, J-C Pain, M Godefroid, P Palmeri, P Quinet
When considering some complex lanthanide ions characterized by a half-filled 4f subshell, the atomic structure Hamiltonian matrix sizes are so large that their diagonalization is challenging and therefore the atomic data of these ions are only used to compute the expansion opacity of a kilonova with difficulty. To avoid this problem, we propose a statistical simulation method to compute kilonova expansion
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Photoionization cross sections of Ethylene oxide J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-05 Jhenifer M H Fófano, Mylena H Ribas, Milton M Fujimoto
In this work a theoretical study for photoionization of Ethylene oxide is presented. The photoionization cross section (PICS) for each of the nine valence orbitals and also the summed cross sections are presented. Electronic structure calculations are done to obtain the required molecular properties and the Variational Schwinger method with Padé approximants is used to calculate the PICS. The results
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Proposal for composite quantum electromagnetically induced transparency heat engine coupled by a nanomechanical mirror J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-05 Rejjak Laskar
This paper introduces a quantum heat engine model that utilizes an ultracold atomic gas coupled with a nanomechanical mirror. The mirror’s vibration induces an opto-mechanical sideband in the control field, affecting the behavior of the cold gas and subsequently influencing the output radiation of the engine. The model incorporates mirror vibration while omitting cavity confinement, establishing a
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Self-bound droplets with uncorrelated disordered potentials J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-02 Karima Abbas, Abdelaali Boudjemaa
Abstract We investigate the effects of an external random $\delta$-correlated potential on the bulk properties of self-bound droplets in three-dimensional binary Bose-Einstein condensates. The ground-state energy and the quantum fluctuation induced by disorder are computed utilizing the Bogoliubov theory. We provide a comprehensive stability phase-diagram for the resulting dirty droplets. At finite
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A data-driven machine learning approach for electron-molecule ionization cross sections J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-02 A L Harris, J Nepomuceno
Despite their importance in a wide variety of applications, the estimation of ionization cross sections for large molecules continues to present challenges for both experiment and theory. Machine learning (ML) algorithms have been shown to be an effective mechanism for estimating cross section data for atomic targets and a select number of molecular targets. We present an efficient ML model for predicting
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Compact gap solitons and compact edge states of exciton–polariton condensates with spin–orbit coupling in a one-dimensional flatband lattice J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-02 Szu-Cheng Cheng, Ting-Wei Chen
We propose that the compact gap solitons and compact edge states can be excited in a flatband of the incoherently-pumped exciton–polariton condensate under a one-dimensional periodic potential lattice. The combined effects of spin–orbit coupling and periodic potential depth on the flatband structures are investigated. Then how the compact gap solitons and edge states are localized and extended inside
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Hybrid magnon-photon system for sensing weak phase J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-02 Jia-Yun Han, Zhao-Peng Tian, Yu-Di Cheng, Hai-Bo Huang, Xue-Liang Zhou, Wen-Huan Wu, Yuan Zhou, Qing-Lan Wang
It belongs to a hot topic to sense or detect the weak and even ultra-weak physical quantities by utilizing quantum platforms and methods. We here propose a hybrid magnon-photon system of the yttrium iron garnet (YIG) magnon mode coupled to a microwave cavity, which also includes another degree of freedom with respect to the thermal vibration of this YIG microsphere. In this quasi-tripartite coupling
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Inner-shell photoelectron spectroscopy unveils the interplay between hydrogen bonds and π−π stacking in clusters of biomolecules in the gas phase: hypoxanthine clusters as a case study J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-01-31 Darío Barreiro-Lage, Giuseppe Mattioli, Chiara Nicolafrancesco, Patrick Rousseau, Aleksandar R Milosavljević, Sergio Díaz-Tendero
We present a joint theoretical-experimental study on the inner-shell photoionization of hypoxanthine clusters in the gas phase. Simulations were performed using a computational strategy that combines molecular dynamics to explore the conformers of the clusters, density functional theory for geometry optimization and inner shell photoionization calculations. Two main intermolecular interactions are
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Quantum dynamics of positron-hydrogen scattering and three-body bound state formation with an assisting laser field: predictions of a reduced-dimensionality model J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-01-25 Xiao Hu Ji, Li Guang Jiao, Aihua Liu, Yong Zhi Zhang, Uwe Thumm, Yew Kam Ho
We investigate the quantum dynamics of target excitation and positronium formation in the positron-hydrogen atom scattering without and with an external assisting laser field within a reduced-dimensional quantum model. Strong interference fringes between the incident and reflected positron wave packets are observed in the reaction region. We further investigate the critical behavior of transition probabilities
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Electron scattering and transport in simple liquid mixtures J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-01-24 G J Boyle, N A Garland, R P McEachran, K A Mirihana, R E Robson, J P Sullivan, R D White
The theory for electron transport in simple liquids developed by Cohen and Lekner (1967 Phys. Rev. 158 305), is extended to simple liquid mixtures. The focus is on developing benchmark models for binary mixtures of hard-spheres, using the Percus-Yevick model (Lebowitz 1964 Phys. Rev. A 133 895, Hiroike 1969 J. Phys. Soc. Japan 27 1415) to represent the density structure effects. A multi-term solution
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Research on the influence of intra-cavity dispersion on pulse characteristics of a quartic soliton fiber laser J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-01-22 Honglin Wen, Lie Liu, Ying Han, Xiaotong Gao, Haijun Gu, Yadong Sun, Bo Gao
We numerically investigate the influence of higher-order dispersion on the dynamics of quartic solitons in a passively mode-locked fiber laser. The simulation results show that the output pulse characteristics of the quartic soliton fiber laser are not only affected by the intra-cavity net dispersion but also related to the position of the single-mode fiber (SMF). For different intra-cavity net higher-order
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Electron and ion spectroscopy of camphor doped helium nanodroplets in the extreme UV and soft x-ray regime J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-01-22 Sanket Sen, S Mandal, S De, Arnab Sen, R Gopal, L Ben Ltaief, S Turchini, D Catone, N Zema, M Coreno, R Richter, M Mudrich, V Sharma, S R Krishnan
We investigate the ionisation and fragmentation dynamics of free camphor molecules and camphor-doped helium nanodroplets by extreme ultraviolet (EUV) and soft x-ray photons using velocity map imaging combined with photoelectron-photoion coincidence (VMI-PEPICO) spectroscopy. We notably find that the Penning ionisation of camphor in He nanodroplets at hν=21.43 eV is soft with nearly identical Penning
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Dissociative electron attachment studies of gas-phase acetic acid using a velocity map imaging technique J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-01-04 Dipayan Chakraborty, Giorgi Kharchilava, Ian Carmichael, Sylwia Ptasinska
Advancing instrumentation to explore dissociative electron attachment (DEA) studies allows previously unattainable information to be acquired. Using a newly constructed velocity map imaging spectrometer, we revisited a study on DEA to gas-phase acetic acid. We discuss possible fragmentation channels and compared the corresponding ion yields with previous high electron-energy resolution results. We
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Resonant x-ray difference frequency generation J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-12-19 Carles Serrat
Resonantly enhanced x-ray difference-frequency generation (re-XDFG) is a second-order nonlinear effect that involves illuminating a molecule with two-color x-ray pulses with photon energies Ω1 and Ω2. The energy difference Ω1−Ω2 is tuned to match an x-ray absorption edge of an atom in the molecule. We have numerically studied the re-XDFG effect considering different individual molecules in the gas
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Enhancement of multimode entanglement and asymmetric steering by noiseless linear amplification J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-12-15 Xiaofeng Wang, Shuqin Zhai
Quantum entanglement and Einstein-Podolsky-Rosen (EPR) steering is an important resource for quantum information. However, it is very fragile and prone to decoherence. Recently, it has been shown that the noiseless linear amplification (NLA) which can be applied to any channel with loss and noise can effectively counteract the effect of quantum decoherence. Besides, the initial quantum correlation
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Electron impact triple differential cross sections of Xe atoms for coplanar to perpendicular plane single ionisation at 60 eV, 80 eV and 100 eV above ionisation J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-12-15 Alpana Pandey, G Purohit, D Kato, W Quint
The evolution of the triple differential cross section (TDCS) for the electron impact ionisation of xenon atoms is reported for the variation of momentum of the projectile electron from a coplanar geometry to a perpendicular plane through intermediate angles with the detection plane. The TDCSs have been calculated for the Xe atoms at 60 eV, 80 eV and 100 eV above the ionisation potential. We have calculated
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Nonorthogonal coding in spectrally-entangled photons J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-12-14 N-Y Tsai, H H Jen
Controlling and engineering continuous spectral modes of entangled photons represents one of the promising approaches toward secure quantum communications. By using the telecom bandwidth generated from a cascade-emitted biphoton in atomic ensembles, a fiber-based long-distance quantum communication can be feasible owing to its low transmission loss. With multiplexed photon pairs, we propose to implement
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Asymmetric solitons induced by transition and beating effects J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-11-17 Xiao-Lin Li, Ling-Zheng Meng, Li-Chen Zhao
We investigate the dynamics of beating solitons in a two-component Bose–Einstein condensate with tunable Rabi coupling strength. Our results demonstrate that the balance between transition and beating effects permits the emergence of a novel family of asymmetric solitons in the symmetric physical settings. We derive the exact analytical solutions for them, which primarily consist of one bright soliton
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Interatomic Coulombic electron capture: the story so far J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-11-13 Annika Bande, Elke Fasshauer, Axel Molle, Daniel Peláez, Federico M Pont, Nicolas Sisourat
Inter-particle Coulombic electron capture (ICEC) is an environment-enabled electron capture process by means of which a free electron can be efficiently attached to a system (e.g. ion, atom, molecule, or quantum dot (QD)). The excess electron attachment energy is simultaneously transferred to a neighbouring system which concomitantly undergoes ionization (or excitation). ICEC has been theoretically
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Optical dipole micro-trap for atoms based on crossed planar photonic waveguides J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-11-08 Yuri B Ovchinnikov, Folly Eli Ayi-Yovo, Alessio Spampinato
Optical dipole micro-traps for atoms based on constructive superposition of two-colour evanescent light waves, formed by corresponding optical modes of two crossed suspended photonic rib waveguides, are modelled. The main parameters of the traps for rubidium atoms, such as potential depth, tunnelling rates of atoms from the trap and coherence time of the trapped atoms are estimated.
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Evolution of the resonances of small water cluster anions (H2O) n ⩽19 − in helium droplets upon attachment of electrons J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-11-06 Elias Jabbour Al Maalouf, Masoomeh Mahmoodi-Darian, Stephan Denifl
Using a high-resolution electron monochromator, we studied the formation of (H2O) n ⩽19 − cluster ions upon collisions of free low-energy electrons with water clusters embedded in helium droplets. The anion efficiency curves as a function of the initial electron energy were measured for the cluster sizes n = 2–8, 10, 13, 16, and 19. The present experimental results show that the shape of the resonance
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Supersensitive phase estimation for hybrid interferometer using balanced homodyne detection J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-11-03 Tao Shao, Minyang Zhang, Chenlu Li, Yuanxiang Wang, Youyou Hu, Mingming Zhang, Jun Liu
We have theoretically investigated the phase sensitivity of the hybrid interferometer with two coherent beams using the method of balance homodyne detection. The measurement device is a nonlinear–linear hybrid interferometer consisting of an optical parametric amplifier and a beam splitter. We prove that the phase sensitivity can beat the shot noise limit in the optimal conditions. Furthermore, we
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Significant non-adiabatic effects of the K(4s2S) + H2 reaction J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-11-03 Wentao Li, Li Wen, Xianghong Niu, Wei Xing
The non-adiabatic dynamical calculations of the K(4s2S) + H2(v 0 = 1, 2, j 0 = 0) reaction are carried out using the time-dependent wave packet method. The non-adiabatic dynamics results, such as reaction probabilities and integral cross sections, are calculated and compared with previous adiabatic values. The adiabatic values are several tens of times larger than those of the non-adiabatic results
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Parity-time symmetry-enhanced simultaneous magnon and photon blockade in cavity magnonic system J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-11-01 Mehri Sadat Ebrahimi, Malek Bagheri Harouni
In this work, we consider a parity-time ( PT ) symmetric cavity magnonic system involving the magnon–photon interaction with small magnon Kerr nonlinearity. Moreover, we investigate the effect of PT -symmetry phase on both the magnon and photon blockade. We show that the PT -symmetry phase, which is achievable by properly selecting the system parameters, can relax the large Kerr nonlinearity requirement
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Relaxation behavior of vibrationally excited N2(X1Σg + v″ = 6) collisions with H2 J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-10-30 Ayxam Mamatimin, Jing Liu, Nurali Habibulla, Abai Alghazi
Relaxation behavior of vibrationally excited N2 (X1Σg + v″ = 6) induced by collisions with H2 has been investigated using coherent anti-Stokes Raman spectroscopy (CARS). The total pressure of the N2–H2 mixture was 500 Torr, and the molar ratios of H2 were 0.3, 0.4, 0.5, 0.6 and 0.8, respectively. The v″ = 6 vibrational state of the electronic ground-state manifold X1Σg + of N2 was selectively excited
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Non-ideal classical plasma: laser pulse effects and dynamic dipole polarizabilities J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-10-27 Shalini Lumb Talwar, Sonia Lumb, K D Sen, Vinod Prasad
The properties of a hydrogen atom inside a non-ideal classical plasma, in terms of its behavior in the presence of an applied laser pulse, are explored. The strength of the pulse is chosen such that it maintains near sphericity of the system. The pulse parameters have a strong bearing on the final state attained by the system after its interaction with the pulse. Dynamic dipole polarizability is calculated
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Simultaneous observation of noble gases and highly charged ions in an electron beam ion trap for accurate wavelength calibration of optical transitions J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-10-27 Naoki Kimura, Nobuyuki Nakamura
Spectral lines of buffer noble gases injected into an electron beam ion trap (EBIT) have recently been used as a reference to aid accurate determination of the wavelengths of optical transitions of highly charged ions (HCIs). Simultaneous observation of emission lines of HCIs along with those of neutral atoms or singly charged ions represents a reliable method for wavelength calibration that suppresses
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Simple Python tools for modelling few-level atom-light interactions J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-10-25 Lucy Downes
Understanding the interactions between atoms and light is at the heart of atomic physics. Being able to ‘experiment’ with various system parameters, produce plots of the results and interpret these is very useful, especially for those new to the field. This tutorial aims to provide an introduction to the equations governing near-resonant atom-light interactions and present examples of setting up and
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Formation of N–O–H bearing species in HNO3 and H2O icy samples by heavy-ion irradiation: an infrared spectroscopic study J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-10-20 A L F de Barros, A Bergantini, E F da Silveira, S D Tozetti, H Rothard, P Boduch, A Domaracka
This article investigates the radiolysis of a mixture of nitric acid with water (HNO3:H2O) at 16 K in high-vacuum (residual pressure < 10−6 mbar). A nitric acid-water ice film was exposed to 40 MeV 58Ni11+ ion beam in a heavy ion accelerator facility in France. For this astrochemically- and atmospherically-relevant ice mixture of nitric acid and water, we analyze the possible formation and destruction
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Experimental setup for probing electron-induced chemistry in liquid micro-jets J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-10-19 Pamir Nag, Miloš Ranković, H Christian Schewe, Jozef Rakovský, Leo Sala, Jaroslav Kočišek, Juraj Fedor
We present an experimental setup for probing chemical changes in liquids induced by electron collisions. The setup utilizes a custom-designed electron gun that irradiates a liquid microjet with an electron beam of tunable energy. Products of the electron-induced reactions are analyzed ex-situ. The microjet system enables re-circulation of the liquid and thus multiple irradiation of the same sample
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Partial identification of visible lines from W24+ ions in an electron-beam ion trap J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-10-18 B L Li, F H Qu, N Fu, Y M Xie, X Liu, Y Yang, B Wei, Y Zou, J Xiao
To better understand the structure of the open 4f shell, the spectroscopic data in the 420–600 nm range of the highly charged ions of W24+ obtained with an electron beam ion trap are presented. Detailed collisional-radiative (CR) modeling has been used to simulate the spectrum. The atomic structure data for the CR modeling were calculated using the relativistic many-body perturbation theory (RMBPT)
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Winding real and order-parameter spaces via lump solitons of spinor BEC on sphere J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-10-18 Yan He, Chih-Chun Chien
The three condensate wavefunctions of a F = 1 spinor Bose–Einstein condensate on a spherical shell can map the real space to the order-parameter space that also has a spherical geometry, giving rise to topological excitations called lump solitons. The homotopy of the mapping endows the lump solitons with quantized winding numbers counting the wrapping between the two spaces. We present several lump-soliton
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Absorption of hybrid fibre modes by Cs atoms in quadrupole transitions J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-10-17 S Bougouffa, M Babiker
We evaluate the rate of the absorption of an optical nanofibre mode by a Cs atom in an electric quadrupole transition. With the Cs atom localised near the outer surface of the optical nano-fibre, an interaction occurs between the atomic quadrupole tensor components and the gradients of the vector components of the electric field of a hybrid fibre mode. The absorption rate is evaluated as a function
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Bogoliubov spectrum and the dynamic structure factor in a quasi-two-dimensional spin-orbit coupled BEC J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-10-12 Inderpreet Kaur, Sankalpa Ghosh
We compute the Bogoliubov–de Gennes excitation spectrum in a trapped two-component spin-orbit-coupled (SOC) Bose–Einstein condensate (BEC) in quasi-two-dimensions as a function of linear and angular momentum and analyze them. The excitation spectrum exhibits a minima-like feature at finite momentum for the immiscible SOC-BEC configuration, which implies dynamical instability. We augment these results
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Hyperfine transition induced by atomic motion above a paraffin-coated magnetic film J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-10-10 Naota Sekiguchi, Hiroaki Usui, Atsushi Hatakeyama
We measured transitions between the hyperfine levels of the electronic ground state of potassium-39 atoms (transition frequency: 460 MHz) as the atoms moved through a periodic magneto-static field produced above the magnetic-stripe domains of a magnetic film. The period length of the magnetic field was 3.8 µm. The atoms were incident to the field as an impinging beam with the most probable velocity
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Generator coordinate method for 1D contacting bosons in harmonic trap J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-09-29 Jing-An Sun, Guang-Jie Guo, Bo Zhou, Yu-Gang Ma
We propose a new method, termed generator coordinate method (GCM)-correlated pair wave function (CPWF), for studying one-dimensional bosons confined in harmonic potentials with contact repulsive interactions. Our approach involves using the effective CPWF as a basis, combined with the GCM to handle complex many-particle correlations accurately. We demonstrate the reliability of our GCM-CPWF wave functions
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Numerical modeling of the multi-stage Stern–Gerlach experiment by Frisch and Segrè using co-quantum dynamics via the Bloch equation J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-09-26 Kelvin Titimbo, David C Garrett, S Süleyman Kahraman, Zhe He, Lihong V Wang
We numerically study the spin flip in the Frisch–Segrè experiment, the first multi-stage Stern–Gerlach experiment, within the context of the novel co-quantum dynamics (CQD) theory. We model the middle stage responsible for spin rotation by sampling the atoms with the Monte Carlo method and solving the dynamics of the electron and nuclear magnetic moments numerically according to the Bloch equation
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Numerical modeling of the multi-stage Stern–Gerlach experiment by Frisch and Segrè using co-quantum dynamics via the Schrödinger equation J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-09-26 Zhe He, Kelvin Titimbo, David C Garrett, S Suleyman Kahraman, Lihong V Wang
We use a theory termed co-quantum dynamics (CQD) to numerically model spin flip in the multi-stage Stern–Gerlach (SG) experiment conducted by R. Frisch and E. Segrè. This experiment consists of two SG apparatuses separated by an inner rotation chamber that varies the fraction of spin flip. To this day, quantum mechanical treatments inadequately predict the Frisch–Segrè experiment. Here, we account
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Enhancement of non-Gaussianity and nonclassicality of pair coherent states by superposition of photon addition and subtraction J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-09-25 Ho Sy Chuong, Truong Minh Duc
Pair coherent states (PCSs) as a kind of two-mode non-Gaussian and nonclassical states were introduced and studied. Some nonclassical characteristics of them such as two-mode sum-squeezing, two-mode antibunching, and entanglement have been well investigated. In this paper, we focus on studying the superposition of photon addition and subtraction to the PCSs called superposition of photon-added and
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Bursts of polarised single photons from atom-cavity sources J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-09-25 Jan Ole Ernst, Juan Rafael Alvarez, Thomas D Barrett, Axel Kuhn
Photonic qubits play an instrumental role in the development of advanced quantum technologies, including quantum networking, boson sampling and measurement based quantum computing. A promising framework for the deterministic production of indistinguishable single photons is an atomic emitter coupled to a single mode of a high finesse optical cavity. Polarisation control is an important cornerstone
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The Faddeev and Schrödinger approaches to Efimov states—a numerical comparison J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-09-22 Kajsa-My Tempest, Svante Jonsell
We compare effective hyperradial three-body potentials calculated using the S-wave part of the Faddeev equations to calculations using the full Schrödinger equation. As two-body model potential we test both a short-range potential and a Lennard-Jones potential with van der Waals tail. In the former case we find excellent agreement between the two methods for the lowest adiabatic state, indicating that
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Rotational wave packet of NO+ created upon strong-field ionization of NO J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-09-21 Shinichi Fukahori, Hirokazu Hasegawa
We theoretically investigate the creation of the rotational wave packet in molecular ions upon the strong-field ionization of diatomic molecules by a femtosecond laser pulse. The rotational excitation of molecular cation is ascribed to the dependence of the strong-field ionization probability on the orientation angle of the molecular axis with respect to the laser polarization direction. By extending
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Study of the velocity-selection satellites present in the 5P3/2→6PJ ( J=1/2, 3/2 ) electric quadrupole transitions in atomic rubidium J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-09-21 F S Ponciano-Ojeda, C Mojica-Casique, L M Hoyos-Campo, F Ramírez-Martínez, J Flores-Mijangos, J Jiménez-Mier
This article presents detailed experimental and theoretical studies of the satellite fluorescence lines observed when the 5P3/2→6PJ , ( J=1/2 , 3/2 ) electric quadrupole transition (E2) is excited in a room temperature vapor of rubidium atoms. The initial state of this E2 transition is prepared by a narrow linewidth (9 MHz) laser locked to one of the dominant 5S1/2→5P3/2 D2 hyperfine excitations for
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Vacuum UV studies of protonated serine clusters J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-09-19 Ori Licht, Maria Nihamkin, Mirit Anaby, Patrick Rousseau, Alexandre Giuliani, Aleksandar R Milosavljević, Raj Singh, Vy T T Nguyen, Laurent Nahon, Yoni Toker
In a recent work, we have shown that photon absorption can cause a chemical bond to be created between the two monomers within a protonated serine dimer, a process known as intra-cluster bond formation, despite this process not occurring following thermal excitation via low energy collision-induced dissociation (LE-CID). Here we show further evidence for non-statistical photon-induced dissociation
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Potential energy curves of molecular nitrogen up to N 24+ J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-09-19 A Hadjipittas, A Emmanouilidou
The potential energy curves for molecular ions up to N 24+ are calculated in an ab initio manner using the multi configurational self-consistent field method. Specifically, we implement in an automatic way a previously used double loop optimisation scheme within the multi configurational self-consisted field method. We obtain the potential energy curves up to N 24+ ions with any combination of core
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Tunable Rydberg–Rydberg transitions in helium with reduced sensitivity to dc electric fields by two-colour microwave dressing J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-09-19 L L Brown, S D Hogan
The difference in the static electric dipole polarizabilities of the 1s55s3S1 and 1s56s3S1 Rydberg levels in helium has been eliminated by dressing the atom with a microwave field near resonant with the single-photon 1s55s3S1→1s55p3PJ transition. For an 2.82mVcm−1 amplitude dressing field, detuned by 2π×10MHz from the zero-field 1s55s3S1→1s55p3P2 transition frequency, the dc Stark shift of the two-photon
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Quantum state engineering in a three-level system with periodical Gaussian pulses J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-09-18 Cheng Yuan, Qiu-Yue Ran, Xiao-Qing Gao, Reuven Ianconescu, Ze-Long He, Du Ran
In this paper, we propose a scheme to achieve selective population transfer in a Λ-type three-level atomic system with a train of periodical Gaussian pulses. Based on temporal constructive quantum interference between the sequential transitions and subsequent coherent accumulations, the selective population transfer can be achieved with the pulse train, without satisfying the requirement of two-photon