Cylindrical vector beams are used to improve back scattering detection in photonic force microscopy measurements near a dielectric surface. We compare back focal plane interferometry signals acquired on a quadrant photodiode when optical trapping a latex microparticle with gaussian, radial, and azimuthal beams. We find a consistent reduction of the interference pattern generated by the superposition

We present the theoretical calculations of the electronic isotope shift factors of the 5d76s24F9/2→(odd,J=9/2) line at 247.587 nm, that were recently used to extract nuclear mean square radii and nuclear deformations of iridium isotopes [Mukai et al. (2020)]. The fully relativistic multiconfiguration Dirac-Hartree-Fock method and the relativistic configuration interaction method were used to perform

Near-field thermophotovoltaic devices are attractive energy conversion systems. In the present study, three-body near-field thermophotovoltaic systems are designed by introducing an intermediate modulator between thermal emitters and photovoltaic cells. The slab/grating emitter and modulator are made from Ga-doped ZnO, while the slab/grating cell is made from gallium antimonide. The scattering matrix

Overcoming the Rayleigh diffraction limit has been a longstanding focus in optical field. In this paper, a complex Gaussian-correlated beam was used as the illumination source, which renders the minimum resolution distance of four symmetrical pinholes at least 0.05 times the Rayleigh diffraction limit. In addition, the method was applied in displacement measurements, which can measure a displacement

The electronic structure and spectroscopic properties of antimony hydride(SbH) have been investigated based on high-level ab initio calculations by utilizing the internally contracted multi-reference configuration interaction plus the Davidson correction(icMRCI+Q) method. The core-valence correlation (CV) and spin–orbit coupling (SOC) effect are considered. The potential energy curves of the 12 Λ-S

Collisional broadening and shift coefficients as well as Dicke narrowing parameters have been measured at room temperature in the 2ν4 band of NH3 perturbed by O2 and N2 for 310 rovibrational lines with rotational quantum numbers 1 ≤ J ≤ 11 and 0 ≤ K ≤ 11. The experiments were performed at room temperature with ammonia mixtures in nitrogen and oxygen at different pressures using a high-resolution Fourier

The optical properties and radiative forcing of atmospheric aerosol (ARF) and black carbon (BC) aerosol (BCRF) in ultraviolet (UV), visible (VIS), near-infrared (NIR), and shortwave (SW) spectra were investigated under haze conditions based on the observations of the Aethalometer and sun-sky radiometer and simulations from libRadtran. The results show that the BC concentrations increased greatly from

A new method for modeling the radiative transfer in inhomogeneous three-dimensional media illuminated by a Gaussian beam is described. This approach, called the Spectral Spherical Harmonics Discrete Ordinate Method (SSHDOM), uses the Fourier expansion method to transform the three-dimensional radiative transfer into an one-dimensional equation in the spectral domain, and the Spherical Harmonics Discrete

Light absorption enhancement (Eabs) of black carbon (BC) aerosol following atmospheric aging is one of the most challenging issues in the assessment of aerosol radiative forcing. BC Eabs is constrained by complex particle morphologies; however, large uncertainties continue to occur due to certain morphological parameters, including primary particle size. The values of Eabs during BC aging is quantified

Four-times ionized cerium (Ce V) is isoelectronic with neutral xenon, having 5s25p6 1S0, the only level in the ground configuration. Previously reported energy levels and line classifications of the 5s25p5 (4f+5d+6d+6s and 6p) configurations were evaluated empirically by means of extended calculations and Boltzmann plots. Here, we have added a new configuration 5s5p64f to the previously reported work

This paper reports that the sodium–potassium (Na–K) lidar was completed in November 2016 at São José Dos Compose, Brazil (23°S, 45°W), by the joint effort of the National Space Science Center, Chinese Academy of Sciences (NSSC) and Instituto Nacional de Pesquisas Espaciais (INPE). This system realized the Na and K metal layers simultaneously observe in Brazil, and this is the first instance of K layer

For accurate line-by-line modeling of molecular cross sections several physical processes “beyond Voigt” have to be considered. For the speed-dependent Voigt and Rautian profiles (SDV, SDR) and the Hartmann-Tran profile the difference w(iz−)−w(iz+) of two complex error functions (essentially Voigt functions) has to be evaluated where the function arguments z ±  are given by the sum and difference of

The opacity information of a finite-temperature plasma is an important property and requires the population distribution of a given plasma condition. A population kinetic code for plasma spectroscopy, FLYCHK, has been widely used by researchers to study the spectroscopic properties of high-energy-density plasmas under a wide range of conditions. In this study, the FLYCHK calculation of the Planck and

The aim of this work is the analysis of the evolution of titania nanoparticles based on their light emission spectra. Measurements are performed during the synthesis of the nanoparticles in a flame spray, which is irradiated by a pulsed IR laser. Due to the relatively high energy band gap of titania of about 3 eV, the observed substantial light absorption at the laser wavelength of 1.064 μm, i.e. within

In this study, banded one gas spectral line-based weighted sum of grey gases (banded SLW-1) model is coupled with a 3-D radiation code based on method of lines (MOL) solution of discrete ordinates method (DOM) for freeboard of METU 0.3 MWt atmospheric bubbling fluidized bed combustion (ABFBC) test rig containing non-gray gas, non-gray particle mixture bounded by non-gray walls. Spectral parameters

Laser powder-bed processing is widely employed in 3D printing. The technological processes strongly depend on such effective radiative-transfer properties of powder beds as the absorptance and the radiation penetration depth. However, it is still not completely clear what are the principal factors influencing these properties and what are the possible ranges of their variation. For theoretical investigation

Measurements of pressure broadening and shift coefficients for 640.2 nm Ne line were performed in an RF discharge without stabilization of neutral gas temperature. A diode laser with a short external cavity was used for metastable neon absorption spectroscopy in a natural mixture of neon isotopes. An appropriate fit function was constructed permitting deduction of Doppler and Lorentz components for

Terahertz emitting and FWM (Four wave mixing) processes in 6P3/2→11DJ near-resonating pumped cesium vapor are studied in this work. Using a nanosecond 550 nm pump laser, collimated frequency converted lights around 557 nm and 563 nm are observed in cesium vapor. A detailed analysis shows that the frequency converted lights come from FWM processes driven by the pump laser and stimulated terahertz emissions

It has been found that near-field radiative heat transfer (NFRHT) between hyperbolic media, such as hexagonal boron nitride (hBN), can be significantly enhanced due to excitation of hyperbolic volume phonon polaritons (HVPPs) and hyperbolic surface phonon polaritons (HSPPs). However, the role of HVPPs and HSPPs in type I and type II hyperbolic bands has rarely been discussed in depth. In this paper

The version 4.0 dataset from the Atmospheric Chemistry Experiment – Fourier Transform Spectrometer (ACE-FTS) on SCISAT, released in March of 2019, has sulfur dioxide (SO2) volume mixing ratio (VMR) profiles as a routine data product. From this dataset, global SO2 distributions between the altitudes of 10.5 km and 23.5 km are analyzed. The global distribution of all SO2 VMR data by altitude is broken

We investigate the generation of the Fourier transform of nondiffracting beams modulated by Gaussian envelope and the propagation through free space of these new generated beams. We exploit the ability of the converging thin lens to perform optical Fourier transform of any arbitrary beam. In the framework of the paraxial approximation, we use Huygens-Fresnel diffraction integral to calculate the expression

Rovibrational energy levels of CP are investigated for its X2Σ+ and A2Π electronic states. Rovibronic frequencies observed experimentally for the A2Π-X2Σ+ transition are used to produce empirical energy levels with the MARVEL method (denoted as MARVEL energy levels). The MARVEL energy levels for the X2Σ+ and A2Π states are then employed to fit the empirical potential energy curves (PECs), spin orbit

Haze incorporating abundant charged aerosol has become a main air problem in various metropolitan cities worldwide. Studying the propagation characteristics of electromagnetic wave (EMW) in charged haze aerosol is conducive to calibrate instruments designed based on energy attenuation of EMW and is critical to providing guidance for deployment of network base stations. Here, we simulated haze conditions

Semi-transparent materials are increasingly applied in various industrial and scientific applications. Because there is a strong coupling between optical and thermal properties of these materials, they pose unique challenges for their modelling and experimental characterization. At PTB, the facilities for spectral emissivity measurement of opaque materials have been expanded for the characterization

Black carbon (BC) aerosols exert important effects on regional and global climate, whilst there still are significant uncertainties in their optical properties, particularly the spectral varying Angstrom exponents. This study numerically evaluates the influences of coating morphologies on optical properties of BC with non-absorbing coating, and evaluates the sensitivity of their Angstrom exponents

Estimates of atmospheric carbon dioxide concentration from satellites now span multiple years and are providing information on key processes in the carbon cycle. Methodology for retrieving CO2 from satellite spectra continues to change as understanding of instrument calibration, other atmospheric constituents, and trace gas spectroscopy improve. In this work, we provide an update to linear error estimates

Thirteen bands of the CS symmetry 16O18O18O ozone isotopic species were observed in spectra generated from 16O2/18O2 mixtures recorded between 950 and 3500 cm−1. Experimentally and theoretically this work is similar to the one on the 16O16O18O isotopologue analysis, recently published [Barbe A, et al. J. Quant. Spectrosc. Radiat. Transfer, 2018;218;231-247]. In total 11402 rovibrational transitions

In two recent papers, it has been demonstrated that, beside usual scattering and optical forces, new optical forces and terms are exhibited when a Rayleigh particle is illuminated by an off-axis Bessel beam. Namely, (i) axicon optical forces are associated with scattering optical forces and (ii) additional axicon terms are associated with gradient optical forces. These extra-axicon forces and terms

This study examines the application of the daytime-mean and insolation-weighted-mean solar zenith angles to calculate the diurnally-averaged aerosol direct radiative effect (DRE), DREDA, for observed clear-sky conditions at the Atmospheric Radiation Measurement Program (ARM) Southern Great Plains (SGP) and Tropical Western Pacific (TWP) sites. As compared with the reference calculation, the DREDA are

Extreme ultraviolet radiation of laser-produced zirconium (Zr) plasmas were measured in the 6.7-14.7 nm region using a spatio-temporally resolved laser-produced plasma spectroscopy technique. At shorter wavelengths, the spectrum was dominated by several lines attributed to the 4s-(6p,7p,8p) transition arrays of Zr6+ to Zr10+ ions. For the 4s-5p and 4p-6s transitions, the spectral lines concentrated

One of the main difficulties to analyze modern spectroscopic datasets is due to the extremely large amount of data. For example, in atmospheric transmittance spectroscopy, the solar occultation channel (SO) of the NOMAD instrument onboard the ESA ExoMars2016 satellite called Trace Gas Orbiter (TGO) had produced ∼ 10 millions of spectra in ∼ 20000 acquisition sequences since the beginning of the mission

We observed the A1Σ+∼b3Π→a3Σ+/X1Σ+ laser-induced fluorescence (LIF) of the RbCs molecule excited from the ground X1Σ+ state by the Ti:Sapphire laser. The LIF spectra from the common perturbed levels of the singlet-triplet A ∼ b complex was recorded by the Fourier-transform (FT) spectrometer with the instrumental resolution of 0.03 cm−1. The relative intensity distribution in the rotationally resolved

The de-noising of lidar signal, especially for the range-dependent systematic noise, always affects the signal-to-noise ratio of lidar signal and the inversion accuracy of aerosol backscatter coefficient. To avoid this issue, a simple de-noising operation is implemented to increase the signal-to-noise ratio and obtain a more accurate aerosol backscatter coefficient. Theoretically, the subjectivity

In this study, the echo speckle characteristics of the Laguerre-Gauss (LG) vortex beams scattered from random rough surface targets were examined based on the Rytov Approximation Theory. In addition, the expressions of the intensity correlation and coherence functions, along with the normalized intensity variances of the speckle fields, were derived. The coherent lengths and scintillation indexes of

By means of laser spectroscopy and optogalvanic detection, we searched for unknown spectral lines of atomic lanthanum (La I) in the red region of the visible spectrum (6900–6200 Å). Most of the discovered lines could be interpreted as transitions between known energy levels due to wavelength and observed hyperfine structure pattern. For lines which we could not classify we searched for laser-induced

In this work, we performed spin-orbit coupling (SOC) included MRCI+Q calculation on electronic states of SbBr. The SOC effect is treated by using the state interaction method in combination with the Breit-Pauli operator. Molecular orbitals are constructed with all-electron aug-cc-pwCVQZ-DK basis sets. Without SOC, total 34 Λ-S states of SbBr are obtained. It is found that the lowest three Λ-S states

Based on the generalized Lorenz-Mie theory (GLMT) and the angular spectrum decomposition method (ASDM), we calculate the time-averaged optical (spin) torque (OST) exerted on an absorptive dielectric sphere of arbitrary size illuminated by a TM polarized Airy light-sheet, and the negative optical torque is particularly emphasized. The influence of the transverse scale parameter w0 and attenuation parameter

We report an experimental study of nonlinear radiation trapping in a high-density rubidium vapor where the self-broadening of the resonance transitions 5S1/2−5P3/2 exceeded the Doppler broadening. The atomic number densities used were N1=3×1016 cm−3 and N2=8×1016 cm−3. In our experiment, a signal of retro-fluorescence was recorded. By means of scanning a single mode laser near the resonance transition

Determination of overlap function is a key step in the calibration of a high-spectral-resolution lidar (HSRL). In this work, an iterative-based general determination (IGD) method for overlap function in HSRL is proposed. Error analysis with Monte-Carlo (MC) simulation is performed and illustrates the algorithm shows high accuracy and has high stability with an accurate lidar ratio assumption. A comparison

For the first time, herein, we report the theoretical investigation on short and elongated photonic nanojets (PNJs) generated by single solid/hollow core-shell microparticles illuminated with focused Gaussian beams (FGBs). This investigation is carried out using developed analytical equations based on Bromwich formalism. The effect of the beam waist, thickness of shell, size and refractive index of

The low-lying electronic states of the tungsten monosulfide (WS) molecule have been investigated using laser-induced fluorescence excitation spectra and high-level ab initio calculations. 29 vibronic bands in total are experimentally observed in the range of 13,100 – 21,500 cm−1 and grouped into 8 electronic transition systems. The spectroscopic constants including the vibrational frequency, rotational

Turbulence-induced wavefront deformations cause the irradiance of an optical signal to fluctuate resulting a in serious degradation in the bit-error-rate (BER) performance of optical wireless communication (OWC) system. Adaptive optics is an effective technique to compensate for the wavefront aberrations to reduce the fluctuations in the received intensity. In this paper, we investigate how the adaptive

XIXth Symposium on High Resolution Molecular Spectroscopy (HighRus-2019).

Ro-vibrationally excited molecules of deuterium are involved in non-equilibrium chemical reactions in divertor region of tokamak, molecular assisted recombination, or in neutral beam injector to produce negative ion, dissociative electron attachment, for fusion plasmas. These molecules produced both in a plasma volume and on surfaces are no longer in their electronic ground state X 1∑g+(v”⩾0,J”) and

In this paper, we present numerical methods for solving the phenomenological scalar radiative transfer equation for a discrete random medium illuminated by a Gaussian beam. These rely on the Fourier transform method for the horizontal variables and the discrete ordinate method with matrix exponential for solving the underlying one-dimensional radiative transfer equation in the wavenumber domain. The

We present results of measurements of the oscillator strength of intercombination lines of He-like Vanadium ions in high energy density (HED) laser-produced-plasmas and compare them with the simulations from commonly used codes and data from the NIST database. Whilst not yet sufficiently accurate to constrain different trusted atomic-physics models for the particular system studied, our results are

The Invariant Imbedding (IIM) T-matrix method has been recognized as one of the most promising method to derive exact solution of the light scattering properties of the nonspherical atmospheric particles after the significant improvement by Bi L. and Yang P. Compared with DDA (Discrete Dipole Approximation) and the time domain methods, it can calculate the scattering properties of the random-oriented

A plane electromagnetic (em) wave, amplitude- and frequency-modulated as a linear chirp, is incident on a dielectric sphere that hosts an eccentric, spherical, pec (perfect electric conductor) inclusion. This radiation problem is solved in the frequency domain by use of symmetry-dependent, spherical eigenvectors, the end-result being a set of linear equations for the wave amplitudes of the frequency

Polarization spectroscopy measurements of O2 B3Σu−←X3Σg− Schumann-Runge absorption are presented. The measurements are carried out in the resonator of a microwave-powered plasma torch operated with O2 at atmospheric pressure. A line-by-line spectral simulation code is developed in order to validate the measured spectra at the expected translational, rotational, and vibrational temperatures Ttrans=Trot=3000 K

We present a novel approach to derive Aerosol Optical Thickness (AOT) at 0.5 µm and the surface reflectance for five spectral channels at native spatial resolution from the measurements of the Polarization and Directionality of Earth’s Reflectances-3 (POLDER) instrument aboard the Polarization & Anisotropy of Reflectances for Atmospheric Sciences coupled with Observations from a Lidar (PARASOL) satellite