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Theoretical study on ground-state hyperfine structure for boron-like ions with 6 ≤ Z ≤ 36 J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-29 Xin Liu, Fanhu Qu, Jiguang Li, Xianwen Zhang, Yiming Xie, Baoren Wei, Yaming Zou, Jun Xiao
The hyperfine structure constants of the 1s22s22p2P1/2 and 2P3/2 states in the boron-like isoelectronic sequence with nuclear charges Z = 6 to 36 were calculated using the multiconfiguration Dirac-Hartree-Fock (MCDHF) method. In these calculations, we included electron correlation, Breit interaction, and one-electron quantum electrodynamics (QED) corrections. It was found that taking into account the
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Estimation of TOA flux and radiance based on the angular distribution of aerosol light scattering measurements J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-15 Soumyajyoti Jana, Mukunda M. Gogoi, T. C. Ajith, Prashant Hegde, Sobhan Kumar Kompalli, S. Suresh Babu
Estimating Top-of-Atmosphere (TOA) flux and radiance is essential for understanding Earth's radiation budget and climate dynamics. This study utilized polar nephelometer measurements of aerosol scattering coefficients at 17 angles (9–170°), enabling the experimental determination of aerosol phase functions and the calculation of Legendre moments. These moments were then used to estimate TOA flux and
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Exploring the impact of rainfall intensity on the attenuation-rainfall relationship J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-15 Saeid Esmaeil Nia, Ali Shokri
The attenuation of electromagnetic waves due to rainfall is a critical factor in radar and telecommunication systems, particularly in frequency bands above 10 GHz, which is increasingly utilised for data transfer. This study addresses the gaps in understanding how these attenuation effects vary across different rainfall intensities and Drop Size Distributions (DSD). By analytically investigating the
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Study on the Himawari-8 aerosol products and aerosol types under the environmental pollution in selected regions of Asia J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-15 Qianjun Mao, Xiaoyan Zhang, Piaopiao Chen, Yunlu Tan, Xiaohu Wu
Aerosols are an important factor leading to reduced visibility. In order to better comprehend the connection between visibility and aerosols, aerosol optical depth (AOD) and Angström exponent (AE) data from the Himawari-8 Advanced Himawari Imager (AHI) are used for validation in comparison with the data from the Aerosol Robotic Network (AERONET) observations in this paper, which amounted to 69,026
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Diffraction Decomposition Order Method for Solving the Vector Radiative Transfer Equation in the Multi-Layer Atmosphere J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-15 Bingqiang Sun, Chenxu Gao
The scattering phase function of atmospheric particle usually has a strong forward peak due to the diffraction effect so that the scattering energy spans large order differences of magnitude in all scattering directions. Correspondingly, the accurate computation of multiple scattering processes in the radiative transfer is high resolution required and time-consuming. A decomposition method is described
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Measurements of He-collision-induced line-shape parameters of CO2 lines in the ν3 band J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-14 F. Hendaoui, D. Jacquemart, A. Hessani, B. Tremblay, H. Aroui, H. Tran
He-collision-induced line-shape parameters of CO2 lines were measured in the ν3 band using Fourier transform spectra recorded at room temperature and with pressures ranging from 263 mbar to 1106 mbar. The measured transmission spectra were analyzed with the Voigt profile combined with the first-order line-mixing approximation, accounting for the instrument line-shape function. The He-broadening coefficients
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Determination of the energy splitting between [formula omitted][formula omitted] and [formula omitted] states in phosphorus-like ions J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-13 Fangshi Jia, Zhaoying Chen, Jialin Liu, Jihui Chen, Liangyu Huang, Zhencen He, Yaming Zou, Yunqing Fu, Baoren Wei, Ke Yao
The spectroscopic investigations on 3p32D5/2−2D3/2 transitions of phosphorus-like Ge17+, As18+, Se19+, Br20+, and Kr21+ ions at an electron beam ion trap were presented. The direct wavelength measurements were reported for the first time for Ge17+−Br20+ ions. All the measurements reached precision levels of a few ppm. The theoretical calculations were carried out using multi-configuration Dirac–Hartree–Fock
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T-matrix computations for light scattering by penetrable particles with large aspect ratios J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-10 M. Ganesh, Stuart C. Hawkins
Using extensive numerical computations for several benchmark geometries, we demonstrate the physical correctness and numerical stability of a two-step algorithm for computing the electromagnetic-scattering T-matrix of homogeneous penetrable three-dimensional scatterers with smooth boundaries. Our numerical results show that the T-matrices computed with our algorithm have high accuracy, even at size
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Emission of electrons and photons and formation of cascade ions during the decay of 125I radionuclide J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-09 A.P. Chaynikov, A.G. Kochur, A.I. Dudenko
Emission of electrons and photons during the cascade decay of inner-shell vacancies created after the decay of unstable 125I radionuclide is simulated by construction and analysis of the cascade decay trees in isolated-ion approximation. The yields of final cascade ions, the number of emitted electrons and photons, and their spectra, are calculated. During one transformation of 125I, the total energy
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Transition rates and electron correlation effects for the 2s2p[formula omitted] ([formula omitted]P)3p configuration in N II J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-09 Xiaozhi Shen, Juan Liu, Chenming Wang, Huaying Wang, Zhanbin Chen, Yan Sun
Based on the multiconfiguration Dirac–Hartree–Fock (MCDHF) method, accurate atomic spectra data including the transition rates, line strengths, and oscillator strengths for the inner-shell excited configuration 2s2p2 (4P)3p in N II ion are reported by taking into account the core-core, core-valence and valence correlation effects as well as the Breit interaction. Good accordance can be found in the
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Speed up the beam shape coefficient evaluation by using scalar spherical wave expansion and scalar translational addition theorem J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-09 Jianqi Shen, Yu Wang, Shiliang Zhong, Yiqian Tian, Haoyu Jiang
The work proposes a two-step indirect method for evaluating the beam shape coefficients (BSCs) of the electromagnetic (EM) field of shaped beams. The spherical wave expansion of the EM field is based on the expansion of the scalar potential function so that the BSCs of the EM field are obtained as the linear combinations of the BSCs of the potential function. By using the scalar translational addition
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A new theoretical method for remotely assessing the health of date palm trees using the scattering/absorption ratio of obliquely incident electromagnetic waves J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-08 Afshin Moradi, Mohammed M. Bait-Suwailam
The present work explores the application of microwave remote sensing to distinguish between healthy and infested date palm trees, using a novel approach centered around the scattering to absorption width ratio (SAWR). Through comprehensive analytical formulations and numerical modeling, we investigate the interaction of palm trees with microwaves at oblique incidence, specifically at a frequency of
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Characteristics of photonic jet formed by an eccentrically coated dielectric sphere J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-04 Huiling Liu, Xingxing Han, Bei Zhao, Jing Shi, Le Zhu
To analyze the influence of eccentricity and the properties of a focused beam on the features of photonic jets (PJs) formed by an eccentrically coated sphere, light scattering of an eccentrically coated sphere illuminated by a focused Gaussian beam is investigated by using the generalized Lorenz-Mie theory. Variations of internal and near-surface field distributions are calculated with the change of
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Simulation of backscattering phase function with the geometric optics method using a paired ray-tracing technique J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-03 Chen Zhou, He Huang, Lei Bi
Geometric optics methods with intensity mapping have been widely used to calculate the single-scattering properties of randomly oriented non-spherical particles with large size parameters, but the backscattering phase functions are often underestimated. The primary reason is that the coherent backscatter enhancement (CBE) is not addressed when the intensity mapping technique is used. In this paper
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Saha–Boltzmann method in plasma diagnostics: What can we obtain from a strict approach? J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-02 Luka Rajačić, Nikodin V. Nedić, Dejan Dojić, Miloš Skočić, Srdjan Bukvić
In this paper, we discuss the technical and numerical aspects related to a specific diagnostic tool, the Saha–Boltzmann plot, introduced in plasma spectroscopy by Yalcin et al. in 1999. The method has a clear physical background and requires only common spectroscopic data as input parameters. The output parameters are the electron temperature and the electron density of the investigated plasma. In
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On a relationship between acoustical (more generally scalar) beam shape coefficients and electromagnetic beam shape coefficients of some T-matrix theories for structured beams J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2025-01-01 Gérard Gouesbet, Leonardo A. Ambrosio, Jianqi Shen
On one hand, we consider two T-matrix theories, namely “Generalized Lorenz–Mie theory” (GLMT) and “Extended Boundary Condition Method” (EBCM), in which structured beams may be expanded over Vector Spherical Wave Functions (VSWFs), with expansion coefficients expressed by using electromagnetic Beam Shape Coefficients (BSCs). On the other hand, we consider acoustical (more generally scalar) fields which
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Global carbon monoxide retrieval from the hyperspectral infrared atmospheric sounder-II onboard FengYun-3E in a dawn-dusk sun-synchronous orbit J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-30 Zhao-Cheng Zeng
This study presents an information content analysis of the retrieval of global carbon monoxide (CO) from the 2nd generation of Hyperspectral Infrared Atmospheric Sounder on board Fengyun-3E (FY-3E/HIRAS-II), which is the world's first dawn-dusk orbiting meteorological satellite for civilian use with equatorial overpass times at about 5:30am/pm. Using the distinctive absorption features of CO around
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Ro-vibrational levels of acetylene isotopologues calculated from new potential energy surface J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-28 Alexander E. Protasevich, Andrei V. Nikitin
Ro-vibrational energy levels of acetylene isotopologues are reported using variational nuclear motion calculations from empirically optimized full six-dimensional potential energy surface (PES) in the ground electronic state. This surface is based on pure ab initio PES of H12C12CH which took into account the triple, quadruple and quintuple excitations as well as relativistic and diagonal Born-Oppenheimer
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Atmospheric Chemistry Experiment (ACE) satellite observations of aerosols and SO[formula omitted] emissions from the 2024 Ruang volcanic eruption J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-28 Randika Dodangodage, Peter F. Bernath, Matthew Wyatt, Chris Boone
Indonesia’s Ruang volcano erupted on April 16, 2024, with subsequent eruptions on April 17 and 30. The resulting plume was observed rising to altitudes of up to 12 km. 10 days after the eruption of the Ruang volcano in April 2024, the Atmospheric Chemistry Experiment (ACE) observed notable increases in SO2 volume mixing ratios and aerosol extinction at an altitude of approximately 20 km. It was confirmed
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The contribution of scattered radiation to the upward radiance of a city J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-26 Jaromír Petržala, Ladislav Kómar
Remote sensing of nighttime urban light emissions becomes a common part of light pollution modeling. Radiance data gathered by various satellites scanning the Earth surface serve as important inputs for estimating the upward luminous flux of a city, which then allows to evaluate the level of light pollution in its surroundings. The easiest way is to assume the measured radiance of a city pixel as belonging
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Global distributions of multi-layer and multi-phase clouds and their cloud radiative effects J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-26 Bingqi Yi, Ruiyi Li, Zhiyong Yang
Accurate and reliable knowledge about how clouds with various layers and phases are vertically and horizontally distributed over the globe has been lacking, which hinders the understanding about the impacts of various sub-types of clouds. This study utilizes the cloud retrieval products from the CloudSat/CALIPSO satellite observations from 2007 to 2010 to analyze the global distributions of multi-layer
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Absorption spectroscopy of AlO including photodissociation J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-25 Tianrui Bai, Lynette Edline Momo Jeulefack, Songfeng Li, Jie Cheng, Shuidong Dai, Linhua Liu, Fei Li
Photodissociation of AlO may be important for the aluminium chemistry in various astrophysical regions. The photodissociation cross sections and rates of AlO were investigated over the temperature range from 0 to 15000 K in this work. Firstly, the state-resolved cross sections at the wavelength of 50 − 5000 nm for transitions from the ground and first excited states were calculated using ab initio
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Updating the carbon dioxide line list in HITEMP J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-24 Robert J. Hargreaves, Iouli E. Gordon, Xinchuan Huang, Geoffrey C. Toon, Laurence S. Rothman
An updated carbon dioxide line list for the HITEMP spectroscopic database is presented. This line list covers the 0–17697 cm−1 (>565 nm) spectral range and is built upon the AI-3000K semi-empirical line list for 12C16O2, 13C16O2, 16O12C18O, and 16O12C17O (Huang et al., 2023), combined with HITRAN2020 data, additional isotopologues, and further improvements described in this work. In order to make the
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Deep sub-wavelength scale focusing of heat flux radiated by magneto-optical nanoemitters in the presence of an external magnetic-field J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-24 Louis Rihouey, Philippe Ben-Abdallah, Riccardo Messina
We introduce a theoretical framework to describe the heat flux radiated in the near-field regime by a set of magneto-optical thermal nanoemitters close to a substrate in the presence of an external magnetic field. Then, we investigate the particular case of a single emitter and we demonstrate that the external field can induce both an amplification of the heat exchanged between emittter and substrate
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Statistical simulation of the angular distribution of reflected solar radiation in optically anisotropic ice-crystal clouds: Horizontally oriented particles J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-22 Tatiana Zhuravleva
The results of statistical modeling of the angular characteristics of reflected solar radiation in the atmosphere containing a layer of ice crystal clouds with anisotropy caused by the orientation of particles in space are presented. Numerical experiments are carried out using (1) original algorithm of the Monte Carlo method for calculating characteristics of unpolarized solar radiation taking into
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Using convolutional neural networks to predict the optical properties of coated black carbon J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-22 Zhenhai Qin, Jinhong Wu, Haihui Wang, Yongming Zhang, Qixing Zhang
Black carbon (BC) is a type of light absorbing substances in atmosphere, which has a significant impact on regional and global radiation balance. When evaluating the climatic effects of BC, the complex morphology of BC poses a challenge for large-scale climate models to proceed with the calculations. In this study, we developed a deep convolutional neural network (CNN) that combines residual links
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Polarization Analysis of Enceladus’ Surface J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-21 Claudia D. Morello, Robert A. West, Matthew J. Berg
Enceladus, the sixth largest moon of Saturn, is known to be a geologically active icy body. Observations by NASA's Cassini spacecraft show that Enceladus has cryovolcanoes on its south pole as well as a global subsurface ocean hidden beneath its frozen crust. Photographs from NASA's Cassini Spacecraft during flybys of Enceladus document Enceladus's surface and the cryovolcano plumes. It is known that
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An effective computational method and analysis of scattering characteristics for sea surface foam layer J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-21 Yue Zhang, Xiaoxiao Yu, Peng Gao, Chunlin Huang, Qixiang Chen, Yuan Yuan, Shikui Dong, Kaifeng Lin
The optical properties of oceanic foam are crucial for satellite remote sensing inversion and target identification, with the volume scattering properties of foam layers significantly influencing the directionality of light scattering, making them a focal point in sea surface scattering research. To achieve efficient computation and analysis of the volume scattering properties of foam layers, this
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Near field radiative heat transfer in twisted bilayer graphene grating structures based on magnetic modulation J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-21 J.X. Wang, Z.G. Xu, F.Q. Zhang
Graphene grating structures have potential in enhancing near-field radiative heat transfer because of their anisotropic properties and single-layer graphene grating structures have shown excellent capability for thermal modulation in magnetic fields. In this study, a theoretical model for the near-field radiative heat transfer under the influence of a magnetic field in twisted bilayer graphene grating
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T-matrix representation of optical scattering response: Suggestion for a data format J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-19 Nigar Asadova, Karim Achouri, Kristian Arjas, Baptiste Auguié, Roland Aydin, Alexandre Baron, Dominik Beutel, Bernd Bodermann, Kaoutar Boussaoud, Sven Burger, Minseok Choi, Krzysztof M. Czajkowski, Andrey B. Evlyukhin, Atefeh Fazel-Najafabadi, Ivan Fernandez-Corbaton, Puneet Garg, David Globosits, Ulrich Hohenester, Hongyoon Kim, Seokwoo Kim, Philippe Lalanne, Eric C. Le Ru, Jörg Meyer, Jungho Mun
The transition matrix, frequently abbreviated as T-matrix, contains the complete information in a linear approximation of how a spatially localized object scatters an incident field. The T-matrix is used to study the scattering response of an isolated object and describes the optical response of complex photonic materials made from ensembles of individual objects. T-matrices of certain common structures
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Pyramid-structured VO2-based thin films with large emissivity tunability for thermochromic radiators J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-18 Yifan Sun, Guoliang Chen, Qingze Chen, Haoyang Fu, Benzhi Min, Zhengwei Tao, Tongtong Yue, Junming Zhao, Jun Qiu
Structure-engineering has proven successful in enhancing the thermochromic properties of VO2-based film for smart thermal management under dynamic thermal loads. However, traditional multilayer structures based on interlayer interference and grating structures based on resonance effect exhibit certain wavelength selectivity, thereby hindering broadband absorption. This limitation constrains the improvement
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Analysis of periodic temporal changes in the spectral signature of IR sources by modeling of spectral artifacts in FTIR systems J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-17 David Santalices, Juan Meléndez, Susana Briz
Periodic fluctuations in the incoming spectrum to a Fourier-transform infrared (FTIR) spectrometer often result in spectral artifacts that can compromise quantitative measurements. This study presents a novel method that relaxes the conventional assumption of uniform fluctuations across all frequencies, by modeling the radiance fluctuations with a Fourier series expansion with wavenumber-dependent
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Electron scattering from hydrogen atom in dense semi-classical hydrogen plasma: S-wave resonance states J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-15 Netai Das, Arijit Ghoshal, Yew Kam Ho
The existence and the behaviour of the resonance states in the scattering of electrons from the hydrogen atoms under semi-classical plasma environments are investigated. The organized effect of the plasma charged particles is modelled by a pseudopotential which takes care of the quantum mechanical effect of diffraction at short distances as well as the collective effect of the plasma particles by means
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Separated and cooperative influence of components of ice cloud on total extinction of optical radiation J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-14 Olga Shefer
For set of crystals with and without taking into account nonsphericity and preferential orientation, there are presented the calculation results that generalize the features of the spectral behavior of the extinction efficiency factor of radiant energy. The influence of various physico-chemical characteristics of scatterers on extinction is demonstrated. The scheme is proposed for comparative analysis
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Comparison of atmospheric river-related phenomena with ACE satellite data J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-10 Adam Pastorek, Peter Bernath
We present a comprehensive data analysis of coincident solar occultation data captured by the ACE satellite, alongside the atmospheric river database derived from MERRA-2 reanalysis through the ARTMIP (Atmospheric River Tracking Method Intercomparison Project) initiative. Our investigation, comparing an atmospheric river catalogue by Guan and Waliser (2015) with experimental ACE data, reveals significant
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Collision expansion for the radiative transport equation: Analytical results and numerical simulations J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-10 Vadim A. Markel, Manabu Machida, John C. Schotland
We consider the collision expansion of the Green’s function of the radiative transport equation (RTE) in an infinite medium. Analytical expressions in terms of quadratures of the most simple form are given for all orders of the expansion. Singularities of the Green’s function are considered in detail. While it is well known that the zeroth and first terms in the expansion are singular (and proportional
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Atmospheric water vapor continuum model for the sub-THz range J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-09 M.Yu. Tretyakov, T.A. Galanina, A.O. Koroleva, D.S. Makarov, D.N. Chistikov, A.A. Finenko, A.A. Vigasin
Empirical and semi-empirical models of the continua absorption are still ubiquitously used in atmospheric science and applications despite almost a hundred-years-long persistent theoretical and experimental investigation of the continuum' nature. Based on the empirical knowledge accumulated to-date about the water vapor continuum we propose a physically sound continuum model for practical applications
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GAAS: GPU accelerated absorption simulator J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-07 Charles S. Callahan, Sean M. Bresler, Sean C. Coburn, David A. Long, Gregory B. Rieker
Interpreting measured absorption spectroscopy data can require repeated simulations of the expected absorption spectrum to fit the data. In cases of high temperature or broadband spectra, the computational load of the spectral analysis can be expensive due to the large number of individual absorption transitions that contribute to each simulation. We present a Graphics Processing Unit (GPU) Accelerated
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Convolutional neural network for 2D-reconstructions of rough particles from their experimental speckle images in interferometric particle imaging J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-06 Alexis Abad, Alexandre Poux, Marc Brunel
A convolutional neural network (CNN) has been trained to reconstruct the two-dimensional (2D) shape of rough particles from their interferometric defocused images. The experimental set-up uses a digital micro-mirror device (DMD). The particles programmed on the DMD can have different morphologies: stick, cross, dendrite, L, T and Y. Sticks, crosses and dendrites are centrosymmetric, while l-, T-, and
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Transmittance of Gaussian beams in biological tissues J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-06 Murat Kaan Özcan, Muhsin Caner Gökçe, Yahya Baykal
The study examines the average transmittance of Gaussian beams passing through various biological tissues, taking into account the impact of turbulence, absorption, and scattering. The extended Huygens-Fresnel technique, which utilizes the power spectrum of turbulent biological tissues, is applied to determine the optical intensity at the observation point. Additionally, there are tabulated absorption
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Inversion of optical constants of natural silk fibers based on FDTD-PSO and scattering experiments J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-05 Zhengwei Tao, Jun Qiu
The optical constants of fiber materials are of great value in the study of the mechanism and application of radiation regulation, but the conventional methods for obtaining the optical constants of fiber materials suffer from a series of problems such as compositional differences, chemical residues, and microstructural damages, which make it difficult to obtain the optical constants of the fiber materials
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Effects of oceanic turbulence on a multi-cosine-Lorentz correlated beam J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-05 Peiying Zhu, Dajun Liu, Yan Yin, Haiyang Zhong, Yaochuan Wang, Guiqiu Wang
The model of a special beam array called multi-cosine-Lorentz correlated (MCLC) beam is introduced, and the coherence function of a MCLC source is related to the multi-cosine function and Lorentz function. The expressions of a MCLC beam in anisotropic oceanic turbulence are derived. Based on the obtained equations, the intensity shapes of a MCLC beam with small δ will become a beam array composed of
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The tenth international symposium on radiative transfer (RAD-23) J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-12-05 Dr. Denis Lemonnier, Prof. Brent W. Webb, Prof. Dr. M.Pınar Mengüç
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Research on underwater polarization distribution reconstruction method for partial occlusion environment J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-28 Ying Ma, Fang Kong, Yinjing Guo, Yaohuang Ruan, Chunxiao Du, Xiaohan Guo, Di Zhang
Underwater polarization imaging technology has important application prospects in marine scientific research, seabed resource exploration, seabed topography drawing, underwater archaeology and other fields. However, underwater polarization images are subject to degradation in image quality during the acquisition process due to occlusion by water grass, fish, and the absorption of water particles in
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MengucM.P.FrancoeurMathieuLight, Plasmonics and Particles2023Elsevier J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-28 Knut Stamnes
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Electrostatic boundary problems and T-matrix for the dielectric half-spheroid J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-28 Matt Majic, Johan C.-E. Stén
We solve the electrostatic boundary problems of a dielectric or conducting hemispheroid (half-spheroid) under arbitrary excitation. The solutions are obtained by expanding the potentials as series of spheroidal harmonics, and integrating over the boundary to obtain matrix equations which can be used to solve for the coefficients. The solutions are used to derive the capacity, polarizability and spatial
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On radial quadrature method applied to spherical wave expansion of Gaussian beams J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-23 Siqi Tang, Jianqi Shen, Gérard Gouesbet, Leonardo A. Ambrosio
The radial quadrature method is proposed recently for evaluating the beam shape coefficients (BSCs) of shaped beams, in which the BSCs are expressed in terms of integrals, infinite series and finite series as well. Previous study reveals that the BSCs expressed in finite series agree exactly with those obtained in the finite series technique and show blowing-ups for high-order partial waves, while
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Optical properties of semi-transparent sensor covers determined from their spectral intensity distribution function J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-22 Miroslav Kocifaj, Tomáš Novák, Igor Medveď
The optical properties of semi-transparent components used as multifunctional coatings or in various non-imaging devices are not always completely known a priori. The quality of plastic covers used in night sky brightness monitors, such as Sky Quality Meter (SQM), can deteriorate with age, causing initially transparent windows to become semi-transparent media that absorb and scatter light. We demonstrate
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Systematic investigations of the hyperfine structure constants of Niobium I levels. Part IV: New results derived from Fourier-transform spectra, including the discovery of four new levels J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-22 L. Windholz, S. Kröger
A determination of the hyperfine structure constants of high lying energy levels of the Niobium (Nb) atom was performed using Fourier-transform spectra. The results obtained complete previous investigations using mainly laser spectroscopy [JQSRT (2020) 245, 106871, 106872, 106873]. In the present work, the hf constants A of altogether 144 levels could be determined, among them 55 levels for which these
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Development and demonstration of a two-color nitric oxide vibrational temperature diagnostic using spectrally-resolved ultraviolet laser absorption J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-21 Spencer C. Barnes, Jesse W. Streicher, Ajay Krish, Ronald K. Hanson
Development of a new ultraviolet (UV) laser absorption diagnostic has enabled the probing of nitric oxide (NO) in the second excited vibrational state (v” = 2) for inferences of quantum-state-specific number density and vibrational temperature time-histories. Spectroscopic modeling informed the selection of the new 246.3222 nm wavelength, as this wavelength exhibits high sensitivity for thermometry
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Modeling of photoplasma for creating EMF in slab cell one-sided irradiated by uniform radiation J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-20 Sergey A. Astashkevich, Anatoly A. Kudryavtsev
A modeling of the photoplasma in a slab cell filled with a sodium vapor and argon mixture one-sided irradiated by a uniform radiation flux was carried out. This study was performed for a spatially heterogeneous distribution of the resonance level density, unlike our previous works. An analytical form of this distribution for the slab available in the literature was used. The present investigation was
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Improved line list of methane in the 900–1050 cm-1 region J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-19 A.V. Nikitin, A.A. Solodov, A.E. Protasevich, M. Rey, A.M. Solodov, V.G. Tyuterev
Four spectra of methane in natural isotopic abundance in the 900–1050 cm-1 region were recorded using a Fourier transform spectrometer in Tomsk, Russia, with long optical paths 167 m and 1058 m at temperatures 28 and 51 °C. Line positions and intensities were retrieved by non-linear least-squares curve-fitting procedures and analyzed using effective Hamiltonian and effective dipole moment models. The
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Hyperfine structure odd-parity configurations of the terbium atom, Part I: Levels with small [formula omitted] J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-18 B. Furmann, M. Klempka, S. Mieloch, D. Stefańska, P. Głowacki
The paper presents the results of measurements of the hyperfine structure for electronic levels belonging to odd configurations in the terbium atom with a small quantum number J. Laser spectroscopy with laser-induced fluorescence detection was used in the measurements. The hyperfine structure of 32 terbium lines was measured in three spectral regions. The hyperfine structure constants were determined
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Computational toolbox for scattering of focused light from flattened or elongated particles using spheroidal wavefunctions J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-18 Alexander B. Stilgoe, Timo A. Nieminen, Halina Rubinsztein-Dunlop
T-matrix methods, with incident and scattered fields described as sums of multipolar fields, are attractive computational methods for many scattering problems due to their versatility, accuracy, and computational efficiency, especially for repeated calculations. However, numerical difficulties often hamper their use for non-spherical particles with large aspect ratios. Further, even if far-field scattering
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Complex refractive index from scattering measurements for an acoustically levitated single particle J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-17 Mikko Vuori, Antti Penttilä, Karri Muinonen, Heikki Suhonen, Joel Jääskeläinen
Sample properties such as shape and size can be studied via light scattering, if the material complex refractive index is known. A numerical method which utilizes laboratory measurements for deriving the complex refractive index of a mm-sized single particle is introduced. The laboratory measurements are carried out using a 4π scatterometer that measures the intensity of polarized light scattered from
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Comparative analysis of theories accounting for quantum effects in plasmonic nanoparticles J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-17 Yuri Eremin, Vladimir Lopushenko
Understanding and accounting for quantum effects in nanoplasmonics is essential for accurate modeling and design of nanophotonic devices. In this paper, we investigate the influence of such quantum effects as spatial nonlocality and splitting of the wave function of conduction electrons near the surface of plasmonic nanoparticles on the extinction cross-section and the field enhancement factor. We
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Electronic structure, spectroscopic constants, and transition properties of NaC [formula omitted] diatomic species: An ab initio investigation J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-17 Yves Hassan Gouromsa, Berthelot Saïd Duvalier Ramlina Vamhindi, Mama Nsangou
Diatomic species play a pivotal role in complex media, such as the interstellar and circumstellar media. Furthermore, there is a notable lack of information regarding NaC and its ions, NaC+ and NaC−, despite the pervasiveness of the carbon element (C) and the validated role of Na-bearing molecules as organic reagents or in catalytic processes. In this study, ab initio multi-reference calculations,
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Hyperfine structure of Lu I transition at 642 nm and its application to explore new odd parity autoionization resonances J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-11-16 Laxmi priya Meher, Vipul Kumar, Diptimayee Biswal, Asawari D. Rath
Resonance ionization mass spectroscopy using three-step photoionization (PI) schemes was employed to study the 642 nm transition of Lu I. Multimode tunable dye lasers were used in these studies to confirm the transition and further characterization of its hitherto unreported hyperfine structure. The hyperfine features of less abundant isotope 176Lu and hyperfine A constant of upper level of 642 nm