Pub Date : 2025-12-22DOI: 10.1016/j.jqsrt.2025.109797
Jolanta Domysławska , Szymon Wójtewicz , Vittorio D’Agostino , Roman Ciuryło , Daniel Lisak
We study the impact of speed-dependent effects and velocity-changing collisions on the parameters of spectral line shapes in the SR subbranch of the band of centered around . High-resolution absorption spectra with a high-signal-to-noise-ratio were acquired using the frequency-stabilized cavity ring-down spectrometer (FS-CRDS) for pure and artificial air ( mixture) samples at room temperature. The measured spectra were fitted using the Voigt profile, the speed-dependent Voigt profile, the speed-dependent Nelkin-Ghatak profile, and the partially correlated speed-dependent Nelkin-Ghatak profile, assuming a quadratic speed dependence of the collisional broadening and shifting. Parameters of advanced line-shape models for the S13R14, S15R16, and S17R18 lines in the air-broadened case have been determined for the first time. The fitted profiles can be considered as simplified forms of the modified Hartmann-Tran profile (mHTP) recommended for the HITRAN database.
{"title":"Speed-dependent effects and velocity changing collisions on the SR subbranch of the 1.27μm band in pure oxygen and air","authors":"Jolanta Domysławska , Szymon Wójtewicz , Vittorio D’Agostino , Roman Ciuryło , Daniel Lisak","doi":"10.1016/j.jqsrt.2025.109797","DOIUrl":"10.1016/j.jqsrt.2025.109797","url":null,"abstract":"<div><div>We study the impact of speed-dependent effects and velocity-changing collisions on the parameters of spectral line shapes in the SR subbranch of the <span><math><mrow><msup><mrow><mi>a</mi></mrow><mrow><mn>1</mn></mrow></msup><msub><mrow><mi>Δ</mi></mrow><mrow><mi>g</mi></mrow></msub><mo>−</mo><msup><mrow><mi>X</mi></mrow><mrow><mn>3</mn></mrow></msup><msubsup><mrow><mi>Σ</mi></mrow><mrow><mi>g</mi></mrow><mrow><mo>−</mo></mrow></msubsup><mrow><mo>(</mo><mn>0</mn><mo>,</mo><mn>0</mn><mo>)</mo></mrow></mrow></math></span> band of <span><math><mrow><msup><mrow></mrow><mrow><mn>16</mn></mrow></msup><msub><mrow><mtext>O</mtext></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> centered around <span><math><mrow><mn>1</mn><mo>.</mo><mn>27</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>. High-resolution absorption spectra with a high-signal-to-noise-ratio were acquired using the frequency-stabilized cavity ring-down spectrometer (FS-CRDS) for pure <span><math><msub><mrow><mtext>O</mtext></mrow><mrow><mn>2</mn></mrow></msub></math></span> and artificial air (<span><math><mrow><msub><mrow><mtext>O</mtext></mrow><mrow><mn>2</mn></mrow></msub><mo>+</mo><msub><mrow><mtext>N</mtext></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> mixture) samples at room temperature. The measured spectra were fitted using the Voigt profile, the speed-dependent Voigt profile, the speed-dependent Nelkin-Ghatak profile, and the partially correlated speed-dependent Nelkin-Ghatak profile, assuming a quadratic speed dependence of the collisional broadening and shifting. Parameters of advanced line-shape models for the S13R14, S15R16, and S17R18 lines in the air-broadened case have been determined for the first time. The fitted profiles can be considered as simplified forms of the modified Hartmann-Tran profile (mHTP) recommended for the HITRAN database.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109797"},"PeriodicalIF":1.9,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145813779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-17DOI: 10.1016/j.jqsrt.2025.109795
Zhaoying Chen , Yuhang Ge , Wenhao Xia , Min Wang , Liangyu Huang , Yaming Zou , Baoren Wei , Xiang Gao , Ke Yao
Spectra of Sr-like Sn, Xe, La, Pr, Nd, and Sm ions in the wavelength range of 200–600 nm were measured using an electron beam ion trap. A total of thirty four magnetic dipole transition lines were identified with twenty four lines newly assigned. Theoretical calculations were performed using the multi-configuration Dirac–Hartree–Fock and relativistic configuration interaction methods, incorporating the Breit interaction and the dominant quantum electrodynamics effects. The calculated results show good agreement with experiment, with an average deviation below 1.0%. The experimental spectra reported provide reliable reference data for further studies.
{"title":"Forbidden lines in highly charged strontium-like ions","authors":"Zhaoying Chen , Yuhang Ge , Wenhao Xia , Min Wang , Liangyu Huang , Yaming Zou , Baoren Wei , Xiang Gao , Ke Yao","doi":"10.1016/j.jqsrt.2025.109795","DOIUrl":"10.1016/j.jqsrt.2025.109795","url":null,"abstract":"<div><div>Spectra of Sr-like Sn<span><math><msup><mrow></mrow><mrow><mn>12</mn><mo>+</mo></mrow></msup></math></span>, Xe<span><math><msup><mrow></mrow><mrow><mn>16</mn><mo>+</mo></mrow></msup></math></span>, La<span><math><msup><mrow></mrow><mrow><mn>19</mn><mo>+</mo></mrow></msup></math></span>, Pr<span><math><msup><mrow></mrow><mrow><mn>21</mn><mo>+</mo></mrow></msup></math></span>, Nd<span><math><msup><mrow></mrow><mrow><mn>22</mn><mo>+</mo></mrow></msup></math></span>, and Sm<span><math><msup><mrow></mrow><mrow><mn>24</mn><mo>+</mo></mrow></msup></math></span> ions in the wavelength range of 200–600 nm were measured using an electron beam ion trap. A total of thirty four magnetic dipole transition lines were identified with twenty four lines newly assigned. Theoretical calculations were performed using the multi-configuration Dirac–Hartree–Fock and relativistic configuration interaction methods, incorporating the Breit interaction and the dominant quantum electrodynamics effects. The calculated results show good agreement with experiment, with an average deviation below 1.0%. The experimental spectra reported provide reliable reference data for further studies.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109795"},"PeriodicalIF":1.9,"publicationDate":"2025-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145784688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-17DOI: 10.1016/j.jqsrt.2025.109794
Sergey A. Astashkevich
A model of a spatially homogenous stationary Cs-containing photoplasma far from optical saturation is developed for uniform spectral pumping within the D1 and D2 cesium line range. The plasma chemistry, radiation transfer, and ambipolar diffusion of charged particles are all explicitly considered. Unlike previous studies of sodium-containing photoplasmas, this work includes associative ionization at both resonance and non-resonance levels. Along with the penning and associative ionization processes, the first and second kind of electron collisions and stepwise ionization were considered. Radiation transfer is accounted for the Voigt profile for the resonance cesium lines in the Biberman-Holstein approximation, taking into account self-broadening and Van der Waals broadening of the lines by the buffer gas atoms. The electron density and temperature and densities of atomic and diatomic cesium ions were determined by solving a system of equations for the atomic level and ion densities as well as the electron energy balance. For example, parameters for pure Cs and Cs–Ar photoplasmas in a cylindrical cell were obtained over a wide range of resonance excitation rates and partial pressures of gas components. A comparison with previously obtained data for cesium and sodium photoplasmas was made. The results can be used to design photoelectric converters based on cesium-containing gas cells.
{"title":"Model study of stationary quasi-homogeneous cesium-containing photoplasma","authors":"Sergey A. Astashkevich","doi":"10.1016/j.jqsrt.2025.109794","DOIUrl":"10.1016/j.jqsrt.2025.109794","url":null,"abstract":"<div><div>A model of a spatially homogenous stationary Cs-containing photoplasma far from optical saturation is developed for uniform spectral pumping within the D1 and D2 cesium line range. The plasma chemistry, radiation transfer, and ambipolar diffusion of charged particles are all explicitly considered. Unlike previous studies of sodium-containing photoplasmas, this work includes associative ionization at both resonance and non-resonance levels. Along with the penning and associative ionization processes, the first and second kind of electron collisions and stepwise ionization were considered. Radiation transfer is accounted for the Voigt profile for the resonance cesium lines in the Biberman-Holstein approximation, taking into account self-broadening and Van der Waals broadening of the lines by the buffer gas atoms. The electron density and temperature and densities of atomic and diatomic cesium ions were determined by solving a system of equations for the atomic level and ion densities as well as the electron energy balance. For example, parameters for pure Cs and Cs–Ar photoplasmas in a cylindrical cell were obtained over a wide range of resonance excitation rates and partial pressures of gas components. A comparison with previously obtained data for cesium and sodium photoplasmas was made. The results can be used to design photoelectric converters based on cesium-containing gas cells.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109794"},"PeriodicalIF":1.9,"publicationDate":"2025-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145784689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-17DOI: 10.1016/j.jqsrt.2025.109793
Haoran Gu , Zhengqiang Li , Yan Ma , Luo Zhang , Cheng Chen , Gerrit de Leeuw , Zihan Zhang , Cheng Fan , Li Li , Zhenwei Qiu , Zhenhai Liu , Jin Hong , Qian Yao , Zhe Ji
Multi-angle polarimetric (MAP) satellite observations provide information on aerosol optical and microphysical properties. In this study, we propose an effective transformer-based deep learning (DL) algorithm for aerosol retrieval using MAP observations, utilizing synergistic observations from the Directional Polarimetric Camera (DPC) and POSP (Particulate Observing Scanning Polarimeter) sensors of the polarization crossfire (PCF) sensor suite. The use of these two sensors overcomes limitations of traditional DL approaches that rely solely on sparse ground-based stations. The proposed algorithm involves two main steps: (1) a date base of over 41,000 high-confidence aerosol samples are is constructed using Aerosol Robotic Network (AERONET) data supplemented by selected high-quality-screening data retrieved from the Particulate Observing Scanning Polarimeter (POSP sensor) from using the Generalized Retrieval of Atmosphere and Surface Properties (GRASP) algorithm; (2) A transformer model is trained on DPC MAP measurements, to learn the nonlinear representation linking spaceborne measurements with targets for estimating aerosol optical depth (AOD), fine-mode AOD (FAOD), and coarse-mode AOD (CAOD) at 550 nm. Comparison of the aerosol parameters derived from application of the transformer model to DPC observational data to AERONET reference data observations, shows substantial improvement over models trained solely on AERONET data, with high Pearson correlation coefficients (R) of 0.855 (AOD), 0.812 (FAOD), and 0.793 (CAOD), and slopes of 0.837, 0.813, and 0.801. Comparison with POSP/GRASP aerosol products shows improved spatial coverage, especially over bright surfaces and during extreme aerosol events such as dust and forest fires. This scalable and transferable framework integrates optimal estimation (OE) interpretability with DL efficiency, achieving 3–4 orders of magnitude speedup over GRASP methods and offering a promising solution for next-generation MAP satellite missions.
{"title":"An efficient transformer-based aerosol retrieval algorithm for the polarization crossfire (PCF) satellite senor suite: development and validation>","authors":"Haoran Gu , Zhengqiang Li , Yan Ma , Luo Zhang , Cheng Chen , Gerrit de Leeuw , Zihan Zhang , Cheng Fan , Li Li , Zhenwei Qiu , Zhenhai Liu , Jin Hong , Qian Yao , Zhe Ji","doi":"10.1016/j.jqsrt.2025.109793","DOIUrl":"10.1016/j.jqsrt.2025.109793","url":null,"abstract":"<div><div>Multi-angle polarimetric (MAP) satellite observations provide information on aerosol optical and microphysical properties. In this study, we propose an effective transformer-based deep learning (DL) algorithm for aerosol retrieval using MAP observations, utilizing synergistic observations from the Directional Polarimetric Camera (DPC) and POSP (Particulate Observing Scanning Polarimeter) sensors of the polarization crossfire (PCF) sensor suite. The use of these two sensors overcomes limitations of traditional DL approaches that rely solely on sparse ground-based stations. The proposed algorithm involves two main steps: (1) a date base of over 41,000 high-confidence aerosol samples are is constructed using Aerosol Robotic Network (AERONET) data supplemented by selected high-quality-screening data retrieved from the Particulate Observing Scanning Polarimeter (POSP sensor) from using the Generalized Retrieval of Atmosphere and Surface Properties (GRASP) algorithm; (2) A transformer model is trained on DPC MAP measurements, to learn the nonlinear representation linking spaceborne measurements with targets for estimating aerosol optical depth (AOD), fine-mode AOD (FAOD), and coarse-mode AOD (CAOD) at 550 nm. Comparison of the aerosol parameters derived from application of the transformer model to DPC observational data to AERONET reference data observations, shows substantial improvement over models trained solely on AERONET data, with high Pearson correlation coefficients (<em>R</em>) of 0.855 (AOD), 0.812 (FAOD), and 0.793 (CAOD), and slopes of 0.837, 0.813, and 0.801. Comparison with POSP/GRASP aerosol products shows improved spatial coverage, especially over bright surfaces and during extreme aerosol events such as dust and forest fires. This scalable and transferable framework integrates optimal estimation (OE) interpretability with DL efficiency, achieving 3–4 orders of magnitude speedup over GRASP methods and offering a promising solution for next-generation MAP satellite missions.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109793"},"PeriodicalIF":1.9,"publicationDate":"2025-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145784687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-15DOI: 10.1016/j.jqsrt.2025.109788
Gérard Gouesbet
It is traditionally accepted that electromagnetic fields which exhibit topological charges are vortex beams. The present paper aims to insist on the fact that this traditional belief is in fact erroneous. We present a general framework, relying on generalized Lorenz–Mie theory and on a superdarkness theorem, allowing one to discover electromagnetic fields with topological charges which are not vortex beams, and exhibit a few examples.
{"title":"On electromagnetic fields with topological charges which are not vortex beams","authors":"Gérard Gouesbet","doi":"10.1016/j.jqsrt.2025.109788","DOIUrl":"10.1016/j.jqsrt.2025.109788","url":null,"abstract":"<div><div>It is traditionally accepted that electromagnetic fields which exhibit topological charges are vortex beams. The present paper aims to insist on the fact that this traditional belief is in fact erroneous. We present a general framework, relying on generalized Lorenz–Mie theory and on a superdarkness theorem, allowing one to discover electromagnetic fields with topological charges which are not vortex beams, and exhibit a few examples.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109788"},"PeriodicalIF":1.9,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145760381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-12DOI: 10.1016/j.jqsrt.2025.109792
Jia Liu , Yunhan Cao , Jiaxing Ren , Xuehai Zhang , Xiaoli Wei , Jinbao Han , Bo Yin
Dust aerosols significantly affect the climate, which can be coated by non-absorptive nitrate and absorptive organic carbon, forming the core-shell structure. Lidar can obtain the size distribution of dust aerosols based on spherical shape assumption and Mie scattering theory. However, this basic assumption significantly differs from the actual dust particles. In this study, optical properties were calculated using the two-layered spheroid model, and backscattering and extinction properties were employed to retrieve dust particle size based on spherical shape assumption. The retrieval error was studied, and the estimation accuracy of radiative effect was analyzed based on the retrieval results. Results show that the relative error (RE) in retrieved size for coated dust with absorptive coatings is lower than that with non-absorptive coatings, and the RE increases with the aspect ratio and core-shell ratio, reaching a maximum of 95.93 %. For dust particle population, most of the retrieved mean radius (rm) based on extinction is underestimated but overestimated based on backscattering, while the retrieved standard deviation (σ) based on two optical properties is all overestimated. The errors in rm and σ are relatively large for dust with absorptive coatings, with the maximum of 10.52 % and 33.70 %, respectively. The simulated radiative effect at the top of the atmosphere (TOA) based on recalculated optical properties using size retrieval results ranges from −192.99 to −4.54 W m−2. The maximum relative error (REF) in radiative effect at TOA for coated dust with absorptive coatings at 355 nm reaches 87.71 %, while it ranges from −35.04 % to 16.13 % for other coating components and wavelengths. The radiative effect assessment has optimal performance when the shape distribution from the Optical Properties of Aerosols and Clouds (OPAC) version 4.0 dataset is employed, with the REF below 10 %.
粉尘气溶胶对气候影响显著，可被非吸收性硝酸盐和吸收性有机碳包裹，形成核壳结构。激光雷达可以基于球形假设和米氏散射理论获得尘埃气溶胶的大小分布。然而，这个基本假设与实际的尘埃颗粒有很大的不同。本研究采用双层球体模型计算了尘埃的光学特性，并基于球形假设利用后向散射和消光特性反演尘埃粒径。研究了检索误差，并根据检索结果分析了辐射效应的估计精度。结果表明，涂有吸附涂层的粉尘粒径反演的相对误差（RE）小于未涂有吸附涂层的粉尘粒径反演的相对误差（RE），且随长径比和核壳比的增大而增大，最大可达95.93%。对于尘埃粒子群，基于消光的平均半径rm被低估，而基于后向散射的平均半径rm被高估，而基于两种光学性质的标准差σ被高估。对于有吸附性涂层的粉尘，rm和σ的误差较大，最大误差分别为10.52%和33.70%。基于尺寸检索结果重新计算光学性质的模拟大气顶部辐射效应（TOA）范围为−192.99 ~−4.54 W m−2。在355nm处，有吸收涂层的粉尘在TOA处辐射效应的最大相对误差（REF）达到87.71%，而其他涂层成分和波长的辐射效应的最大相对误差在−35.04% ~ 16.13%之间。采用OPAC 4.0版本数据集的形状分布，当REF值小于10%时，辐射效应评估效果最佳。
{"title":"Numerical investigation on size retrieval error for coated dust aerosol with different shape distributions based on spherical shape assumption and the effects on radiative estimation","authors":"Jia Liu , Yunhan Cao , Jiaxing Ren , Xuehai Zhang , Xiaoli Wei , Jinbao Han , Bo Yin","doi":"10.1016/j.jqsrt.2025.109792","DOIUrl":"10.1016/j.jqsrt.2025.109792","url":null,"abstract":"<div><div>Dust aerosols significantly affect the climate, which can be coated by non-absorptive nitrate and absorptive organic carbon, forming the core-shell structure. Lidar can obtain the size distribution of dust aerosols based on spherical shape assumption and Mie scattering theory. However, this basic assumption significantly differs from the actual dust particles. In this study, optical properties were calculated using the two-layered spheroid model, and backscattering and extinction properties were employed to retrieve dust particle size based on spherical shape assumption. The retrieval error was studied, and the estimation accuracy of radiative effect was analyzed based on the retrieval results. Results show that the relative error (<em>RE</em>) in retrieved size for coated dust with absorptive coatings is lower than that with non-absorptive coatings, and the <em>RE</em> increases with the aspect ratio and core-shell ratio, reaching a maximum of 95.93 %. For dust particle population, most of the retrieved mean radius (<em>r<sub>m</sub></em>) based on extinction is underestimated but overestimated based on backscattering, while the retrieved standard deviation (<em>σ</em>) based on two optical properties is all overestimated. The errors in <em>r<sub>m</sub></em> and <em>σ</em> are relatively large for dust with absorptive coatings, with the maximum of 10.52 % and 33.70 %, respectively. The simulated radiative effect at the top of the atmosphere (TOA) based on recalculated optical properties using size retrieval results ranges from −192.99 to −4.54 W m<sup>−2</sup>. The maximum relative error (<em>RE<sub>F</sub></em>) in radiative effect at TOA for coated dust with absorptive coatings at 355 nm reaches 87.71 %, while it ranges from −35.04 % to 16.13 % for other coating components and wavelengths. The radiative effect assessment has optimal performance when the shape distribution from the Optical Properties of Aerosols and Clouds (OPAC) version 4.0 dataset is employed, with the <em>RE<sub>F</sub></em> below 10 %.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109792"},"PeriodicalIF":1.9,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145731357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-12DOI: 10.1016/j.jqsrt.2025.109790
Zhirong Liu , Shiwei Liu
This article extended the scope of the scattering theory of vector partially coherent light field by investigating the scattering of specially correlated radially polarized (SCRP) beams from a semi-soft boundary medium. Through complex calculation, cross spectral density (CSD) matrix of the targeted scattering light field was obtained, and then, scattered spectral density, degree of coherence (DOC), and degree of polarization (DOP) of the scattered light field were analyzed. Furthermore, variations of the scattered light field were examined by selecting different parameter values of the incident light and the medium. Results indicated that, through scattering regulation, hollow, flat-top, or Gaussian distributions could be formed for the SCRP beams, and DOC of the scattering light field was mainly influenced by the medium, instead of the incident light source. In addition, it was of interest to find that the central region of the scattering light field exhibited complete depolarization, while the surrounding was nearly fully polarized. These findings would broaden the domain of scattering research, and provided a physical basis for both theoretical investigation and practical application.
{"title":"Specially correlated radially polarized beams scattered by a semi-soft boundary medium","authors":"Zhirong Liu , Shiwei Liu","doi":"10.1016/j.jqsrt.2025.109790","DOIUrl":"10.1016/j.jqsrt.2025.109790","url":null,"abstract":"<div><div>This article extended the scope of the scattering theory of vector partially coherent light field by investigating the scattering of specially correlated radially polarized (SCRP) beams from a semi-soft boundary medium. Through complex calculation, cross spectral density (CSD) matrix of the targeted scattering light field was obtained, and then, scattered spectral density, degree of coherence (DOC), and degree of polarization (DOP) of the scattered light field were analyzed. Furthermore, variations of the scattered light field were examined by selecting different parameter values of the incident light and the medium. Results indicated that, through scattering regulation, hollow, flat-top, or Gaussian distributions could be formed for the SCRP beams, and DOC of the scattering light field was mainly influenced by the medium, instead of the incident light source. In addition, it was of interest to find that the central region of the scattering light field exhibited complete depolarization, while the surrounding was nearly fully polarized. These findings would broaden the domain of scattering research, and provided a physical basis for both theoretical investigation and practical application.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109790"},"PeriodicalIF":1.9,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145731358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-11DOI: 10.1016/j.jqsrt.2025.109791
Augusto García-Valenzuela, Nadia E. Álvarez-Chávez, Anays Acevedo-Barrera
We study the applicability of the Arago-Biot mixing formula to calculate the effective refractive index of particle suspensions using the anomalous diffraction approximation, when the size of the particles is comparable to the wavelength of radiation. Interest in this mixing formula stems from the fact that it does not require knowledge of the particles' size or shape. Thus, it can be useful for determining the refractive index of particles in suspension of size comparable to the wavelength of radiation, regardless of their shape or size distribution. We present an analysis and graphs in the refractive-index-contrast versus size-parameter 2D space of the error of the Arago-Biot mixing formula and the error of using this mixing formula to infer the refractive index of particles in suspension. We consider non-absorbing and absorbing particles. The results obtained demonstrate the viability of inferring the refractive index of particles in suspension with accuracy in the second decimal place by reducing the refracting index contrast with the matrix medium for particles comparable to the wavelength of light.
{"title":"Applicability of the Arago-Biot mixing formula to the effective refractive index of particle suspensions","authors":"Augusto García-Valenzuela, Nadia E. Álvarez-Chávez, Anays Acevedo-Barrera","doi":"10.1016/j.jqsrt.2025.109791","DOIUrl":"10.1016/j.jqsrt.2025.109791","url":null,"abstract":"<div><div>We study the applicability of the Arago-Biot mixing formula to calculate the effective refractive index of particle suspensions using the anomalous diffraction approximation, when the size of the particles is comparable to the wavelength of radiation. Interest in this mixing formula stems from the fact that it does not require knowledge of the particles' size or shape. Thus, it can be useful for determining the refractive index of particles in suspension of size comparable to the wavelength of radiation, regardless of their shape or size distribution. We present an analysis and graphs in the refractive-index-contrast versus size-parameter 2D space of the error of the Arago-Biot mixing formula and the error of using this mixing formula to infer the refractive index of particles in suspension. We consider non-absorbing and absorbing particles. The results obtained demonstrate the viability of inferring the refractive index of particles in suspension with accuracy in the second decimal place by reducing the refracting index contrast with the matrix medium for particles comparable to the wavelength of light.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109791"},"PeriodicalIF":1.9,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145731366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-08DOI: 10.1016/j.jqsrt.2025.109789
Leonardo A. Ambrosio , Luiz F.M. Votto , Jianqi Shen , Gérard Gouesbet , Jiajie Wang
In light and acoustic scattering, physical fields such as acoustic pressure and electromagnetic waves are expanded in partial waves, the expansion coefficients being known as the beam shape coefficients (BSCs). In acoustics, the BSCs are found from scalar fields, while in optics transverse magnetic and electric BSCs are calculated from the radial electric and magnetic field components, respectively. The relationship between acoustic and electromagnetic BSCs has been a recent active area of research. Previous works have focused on the assumption that such a relationship can be established by forcing the acoustic/scalar fields to be particular components of electromagnetic vector potentials. Here, we present an alternative approach in which the scalar fields are directly associated with a transverse electric field component. Such an analysis extends previous work and allows for a direct description of the electromagnetic BSCs of important optical fields from scalar waves. The analysis is restricted to solutions to the scalar Helmholtz equation which carry a propagating factor of the form , such a factor being the only one to carry any dependence on the axial coordinate. An example is provided for a specific class of structured, non-diffracting fields constructed from discrete superpositions of Bessel beams, known in the literature as frozen waves.
{"title":"Relationship between scalar and electromagnetic beam shape coefficients for fields with a propagating factor of exp(±iβz): Linear and circular polarizations","authors":"Leonardo A. Ambrosio , Luiz F.M. Votto , Jianqi Shen , Gérard Gouesbet , Jiajie Wang","doi":"10.1016/j.jqsrt.2025.109789","DOIUrl":"10.1016/j.jqsrt.2025.109789","url":null,"abstract":"<div><div>In light and acoustic scattering, physical fields such as acoustic pressure and electromagnetic waves are expanded in partial waves, the expansion coefficients being known as the beam shape coefficients (BSCs). In acoustics, the BSCs are found from scalar fields, while in optics transverse magnetic and electric BSCs are calculated from the radial electric and magnetic field components, respectively. The relationship between acoustic and electromagnetic BSCs has been a recent active area of research. Previous works have focused on the assumption that such a relationship can be established by forcing the acoustic/scalar fields to be particular components of electromagnetic vector potentials. Here, we present an alternative approach in which the scalar fields are directly associated with a transverse electric field component. Such an analysis extends previous work and allows for a direct description of the electromagnetic BSCs of important optical fields from scalar waves. The analysis is restricted to solutions to the scalar Helmholtz equation which carry a propagating factor of the form <span><math><mrow><mo>exp</mo><mrow><mo>(</mo><mo>±</mo><mi>i</mi><mi>β</mi><mi>z</mi><mo>)</mo></mrow></mrow></math></span>, such a factor being the only one to carry any dependence on the axial coordinate. An example is provided for a specific class of structured, non-diffracting fields constructed from discrete superpositions of Bessel beams, known in the literature as <em>frozen waves</em>.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109789"},"PeriodicalIF":1.9,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145704974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-08DOI: 10.1016/j.jqsrt.2025.109785
Héctor Antonio Solano Lamphar
Artificial Light at Night (ALAN) poses significant public health challenges by disrupting circadian rhythms and increasing melatonin suppression. This study introduces a dynamic modeling framework employing synthetic population simulations to quantify the health impacts of ALAN under varying exposure scenarios. The model integrates spatial, temporal, behavioral, and policy dimensions, enabling the evaluation of interventions such as warm LED lighting (, ), lighting ordinances, and community-wide curfews. Simulations demonstrate that these interventions can reduce melatonin suppression by up to 25% in high-risk zones. Clustering analysis identifies high-suppression areas, providing critical insights for urban planning and policymaking. Sensitivity analyses highlight the pivotal role of policy compliance and behavioral adaptations in mitigating ALAN’s health impacts. Using synthetic populations ensures ethical compliance by avoiding real human data, while the model’s scalability supports application across diverse urban contexts. Future work will integrate ground based illuminance measurements to enhance predictive accuracy and support equitable strategies for mitigating ALAN’s health impacts.
{"title":"Modeling the health impacts of urban light pollution: Synthetic populations and behavioral interventions","authors":"Héctor Antonio Solano Lamphar","doi":"10.1016/j.jqsrt.2025.109785","DOIUrl":"10.1016/j.jqsrt.2025.109785","url":null,"abstract":"<div><div>Artificial Light at Night (ALAN) poses significant public health challenges by disrupting circadian rhythms and increasing melatonin suppression. This study introduces a dynamic modeling framework employing synthetic population simulations to quantify the health impacts of ALAN under varying exposure scenarios. The model integrates spatial, temporal, behavioral, and policy dimensions, enabling the evaluation of interventions such as warm LED lighting (<span><math><mrow><mo>≤</mo><mn>3000</mn><mspace></mspace><mtext>K</mtext></mrow></math></span>, <span><math><mrow><mo>≤</mo><mn>10</mn><mtext>%</mtext><mo>,</mo><mtext>emission at 450–490 nm</mtext></mrow></math></span>), lighting ordinances, and community-wide curfews. Simulations demonstrate that these interventions can reduce melatonin suppression by up to 25% in high-risk zones. Clustering analysis identifies high-suppression areas, providing critical insights for urban planning and policymaking. Sensitivity analyses highlight the pivotal role of policy compliance and behavioral adaptations in mitigating ALAN’s health impacts. Using synthetic populations ensures ethical compliance by avoiding real human data, while the model’s scalability supports application across diverse urban contexts. Future work will integrate ground based illuminance measurements to enhance predictive accuracy and support equitable strategies for mitigating ALAN’s health impacts.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109785"},"PeriodicalIF":1.9,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145704977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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