Journal of Quantitative Spectroscopy & Radiative Transfer最新文献

{"title":"Shift of the linear polarization angle of light scattered by anisotropic aerosol and hydrosol particles","authors":"Ynon Hefets,&nbsp;Carynelisa Haspel","doi":"10.1016/j.jqsrt.2025.109593","DOIUrl":"10.1016/j.jqsrt.2025.109593","url":null,"abstract":"<div><div>We simulate single scattering by two types of compositions of scatterers, soot-aerosol-like and organic/mineral-hydrosol-like, with three different overall shapes, ideal amorphous solid spherical aggregates, fractal aggregates, and helices. We expand our recently developed flexible scattering order formulation of the discrete dipole approximation approach to allow birefringent as well as isotropic polarizabilities. Using this formulation for simulating birefringence and the multiple sphere T-matrix (MSTM) model for simulating intrinsic chirality, we contrast the scattering by particles with anisotropic refractive indices, both optically active and birefringent. Then for each polarizability, we calculate the shift of the linear polarization angle (SoLPA) of the scattered light relative to the scattering plane. We investigate the influence of chirality strength, absorption, birefringence strength, and scatterer size on the SoLPA. We find that for single scattering, the SoLPA resulting from intrinsic optical activity is relatively low (<span><math><mrow><mo>≲</mo><msup><mrow><mn>1</mn></mrow><mo>∘</mo></msup></mrow></math></span>), while the SoLPA resulting from birefringence can be relatively large (&gt;1°) or even very large in some cases (&gt;10°). We find that the SoLPA increases approximately linearly with chirality strength, and for low to moderate birefringence strengths, the SoLPA is also increases approximately linearly with birefringence strength. However, for higher birefringence strengths, the linearity of the SoLPA with birefringence strength can break down. We also find that the spatial patterns of the variations in SoLPA as a function of intrinsic chirality strength and birefringence strength tend to be similar for the fractal aggregate and helical scatterers but differ significantly for the ideal amorphous solid aggregate as compared to the other two shapes. This result has implications for any scattering particle whose constituent parts are not arranged on a regular, crystalline-like grid. The SoLPA examined here can become even more significant in multiple scattering environments and thus could have important implications for remote sensing and understanding of polarization sensitive marine species.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"346 ","pages":"Article 109593"},"PeriodicalIF":1.9,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144670117","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}

{"title":"WARPE: A parallelized Monte Carlo ray tracing approach to evaluate the travel-time in turbid plane-parallel media with interfaces","authors":"J. Barron ,&nbsp;F. Schmidt ,&nbsp;F. Andrieu","doi":"10.1016/j.jqsrt.2025.109575","DOIUrl":"10.1016/j.jqsrt.2025.109575","url":null,"abstract":"<div><div>We present a Monte Carlo Ray tracing model called WARPE (Waveform Analysis and Ray Profiling for Exploration) to study the travel-time in turbid plane-parallel media with possible interaction at interfaces. It is an efficient model with a fast computation time guaranteed by ray batch parallelization. This model has been validated for both spatial and time dimension of the radiative transfer using robust reference models. An application to explore the influence of the radiative parameters has been conducted and reveal that optical depth, single scattering albedo, directionality of the medium, refractive index and extinction coefficient have a crucial role on the time-resolved reflectance. This is illustrated by peak features representing the various back and forth travels of the light in the medium for both diffused and unaffected rays. The top reflection at the first interface and the background scattering are described as well. This model shall be used with inversion method in order to interpret real data to improve the understanding of the microphysics of turbid media with interfaces.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"346 ","pages":"Article 109575"},"PeriodicalIF":2.3,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144670119","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}

{"title":"The Stark effect at high electric fields in the near-infrared spectrum of atomic carbon","authors":"Slawomir Werbowy","doi":"10.1016/j.jqsrt.2025.109578","DOIUrl":"10.1016/j.jqsrt.2025.109578","url":null,"abstract":"<div><div>Studies of the static Stark effect for the near-infrared lines: 833.514 nm, 906.143 nm, 906.247 nm, 907.828 nm, 908.851 nm, 909.483 nm, 911.180 nm, 940.573 nm, 960.303 nm, and 962.078 nm (air wavelengths) of atomic carbon are reported. From the Stark patterns recorded at very high electric fields up to 660 kV/cm the differences of the scalar polarizabilities <span><math><mrow><mi>Δ</mi><msub><mrow><mi>α</mi></mrow><mrow><mn>0</mn></mrow></msub></mrow></math></span> for the investigated lines were determined. The tensor polarizabilities <span><math><msub><mrow><mi>α</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> were found to be very small and below the capabilities of the current experience. For all lines, the following are the first experimental results.</div><div>The polarizabilities <span><math><msub><mrow><mi>α</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> and <span><math><msub><mrow><mi>α</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> have been calculated for investigated levels of the 2s<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>2p3s and 2s<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>2p3p configurations based on the experimental results. The agreement between the calculation and experimental results is very good. This allowed for the prediction of reliable values for other lines involving the studied energy levels in this difficult spectral range. The presented data should serve as a basis for the analysis of the Stark and ion broadening in a plasma.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"345 ","pages":"Article 109578"},"PeriodicalIF":2.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655803","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}

{"title":"Microwave radiometric measurements and simulations of the Zeeman-affected rotational transition of oxygen at 233.95 GHz","authors":"Richard Johansson ,&nbsp;Uwe Raffalski ,&nbsp;Mathias Milz ,&nbsp;Richard Larsson","doi":"10.1016/j.jqsrt.2025.109579","DOIUrl":"10.1016/j.jqsrt.2025.109579","url":null,"abstract":"<div><div>In this study, we present measurements of the Zeeman affected rotational transition of atmospheric oxygen (<span><math><mrow><msup><mrow></mrow><mrow><mn>16</mn></mrow></msup><msup><mrow><mi>O</mi></mrow><mrow><mn>18</mn></mrow></msup><mi>O</mi></mrow></math></span>) at 233.95 GHz. These observations were conducted using the KIruna Microwave RAdiometer (KIMRA) at the Swedish Institute of Space Physics (IRF) in Kiruna, Sweden. The data presented here are an example set of our continuous observations collected during a calm period of Earth’s magnetosphere on January 4, 2024, in four different lines of sight. All measurements were taken at a fixed zenith angle of <span><math><mrow><mn>77</mn><mo>.</mo><mn>6</mn><mo>°</mo></mrow></math></span>, while the azimuth angle varied from 0° to 270° in steps of 90°. The measurements successfully resolved each sub-line of the transition, and comparisons with simulations performed using PyARTS showed excellent agreement between the observations and simulations in all directions. Oxygen emission lines at lower frequencies have been used to retrieve temperature profiles in the stratosphere. We found, however, that the signatures at this particular frequency at 233.95 GHz are not suited for atmospheric temperature profiling unlike those at lower frequencies, such as 118 GHz or signatures in the 50–60 GHz Oxygen band.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"346 ","pages":"Article 109579"},"PeriodicalIF":1.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144670121","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}

{"title":"Zeeman- hyperfine structure of niobium by laser spectroscopy investigations","authors":"Ł.M. Sobolewski ,&nbsp;B. Furmann ,&nbsp;P. Głowacki ,&nbsp;D. Stefańska","doi":"10.1016/j.jqsrt.2025.109580","DOIUrl":"10.1016/j.jqsrt.2025.109580","url":null,"abstract":"<div><div>Laser induced fluorescence spectroscopy was used for the investigation of the Zeeman-hyperfine structure of 21 lines of atomic niobium in the visible region from 498 to 564 nm. The source of atoms was the hollow cathode discharge lamp. The magnetic field of approximately 900 G was produced by a permanent neodymium magnet. Landé <span><math><msub><mrow><mi>g</mi></mrow><mrow><mi>J</mi></mrow></msub></math></span> factor values for 3 levels were experimentally determined for the first time. For 9 other levels more accurate results were obtained. In addition earlier experimental data on the hyperfine structure as well as the data regarding Landé <span><math><msub><mrow><mi>g</mi></mrow><mrow><mi>J</mi></mrow></msub></math></span> factors were verified.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"345 ","pages":"Article 109580"},"PeriodicalIF":2.3,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144634395","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}

{"title":"Radiation characteristics of microalgae for different aggregation states: a case of Scenedesmus obliquus","authors":"Tianbo Hou,&nbsp;Chenghao Lv,&nbsp;Miao Jiang,&nbsp;Zongyu Xiao,&nbsp;Xingcan Li","doi":"10.1016/j.jqsrt.2025.109584","DOIUrl":"10.1016/j.jqsrt.2025.109584","url":null,"abstract":"<div><div>The aggregation state of microalgae during their growth process has a significant impact on their optical radiation characteristics. This article takes <em>Scenedesmus obliquus</em> as an example and proposes a novel cell construction method that comprehensively considers the complex multi-component structure of microalgae. Three different models, namely single growth, paired growth, and four aggregation growth are established for microalgae cells with different aggregation states. The DDA (Discrete Dipole Approximation) method is used for theoretical calculations and compared with experimental data for verification. Compared with the models of <em>Scenedesmus obliquus</em> in three aggregation states (single, paired, and four growth), the weighted average calculation effectively reduced the theoretical calculation deviation by 15 % - 200 % through the weighted average of the results. The results show that the microalgae cell model considering multi-component complex structures has high computational accuracy and is in good agreement with experimental results. In addition, when considering the effect of microalgae cell aggregation, the absorption cross-section and scattering cross-section are greatly affected, while the scattering phase function is less affected by aggregation. The values of absorption cross-section and scattering cross-section grow in a multiplicative manner with the increase of aggregation numbers.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"345 ","pages":"Article 109584"},"PeriodicalIF":2.3,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622464","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}

{"title":"Measurements and calculations of H2O broadened by CO2 collisional parameters for planetary atmospheres","authors":"É. Ducreux ,&nbsp;B. Vispoel ,&nbsp;B. Grouiez ,&nbsp;R.R. Gamache ,&nbsp;M. Lepère ,&nbsp;S. Robert ,&nbsp;L. Régalia","doi":"10.1016/j.jqsrt.2025.109576","DOIUrl":"10.1016/j.jqsrt.2025.109576","url":null,"abstract":"<div><div>Collisional parameters of H₂O with CO₂ are currently missing from international spectroscopic databases, although they are essential for accurate modeling of water vapor in CO₂-rich planetary atmospheres. In this study, high-resolution infrared spectra of H₂O broadened by CO₂ were recorded using a Fourier Transform Spectrometer in the 1.18 and 2.34 µm spectral regions. CO₂-collisional parameters for selected H₂O transitions were derived through a multispectrum fitting procedure employing both Voigt and quadratic speed-dependent Voigt profiles. Furthermore, calculations based on the semi-classical Complex Robert-Bonamy-Ma formalism were performed to estimate CO₂-broadened half-widths, line shifts, and their temperature dependencies across various atmospheric transparency windows. It results in a strong agreement between theoretical predictions and experimental data. Finally, the shared calculated linelist, obtained for a wide range of transitions, can be directly applied to radiative transfer modeling of atmospheres primarily composed of carbon dioxide.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"345 ","pages":"Article 109576"},"PeriodicalIF":2.3,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622470","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}

{"title":"An On-orbit parameter adjustment approach for DQ-1 Directional Polarimetric Camera based on the cloud data of MODIS/AUQA","authors":"Bihai Tu ,&nbsp;Lanlan Fan ,&nbsp;Pingping Yao ,&nbsp;Rufang Ti ,&nbsp;Yi Wang ,&nbsp;Haixiao Yu ,&nbsp;Guangfeng Xiang ,&nbsp;Binghuan Meng ,&nbsp;Jin Hong","doi":"10.1016/j.jqsrt.2025.109582","DOIUrl":"10.1016/j.jqsrt.2025.109582","url":null,"abstract":"<div><div>The Directional Polarimetric Camera (DPC) has been successfully launched on April 16, 2022, onboard the Atmospheric Environment Monitoring Satellite (DQ-1). The DPC is an ultra-wide-angle satellite-borne sensor with a swath width of 1850 km, enabling global coverage within two days. The DPC offers three operational modes: land, ocean, and custom. Given the lack of on-board calibrator, the initial state needs to be calibrated through natural features to determine the instrumental parameters suitable for cloud measurements. Meanwhile, the data products of MODIS are used as references. The experimental results show that: 1) the initial cloud optical thickness (COT) histogram trend is consistent, with significant differences in high value areas. The preset parameters limit the calculation of thick clouds with COT greater than 50, presenting a saturation situation; 2) Selecting the deep convective cloud (DCC) targets, quantitative analysis is conducted between MODIS band 1 L1B data and DPC data. The reflectance at the top of the atmosphere (TOA) of DPC approaches saturation at 0.85; 3) the custom mode is selected, the integration time is reduced by 25 %, the instructions are injected from the ground station. The DPC high reflectivity range is linearly consistent with MODIS, the deviation is &lt;2 %, and the distribution of cloud optical thickness products is in good agreement. The on-orbit parameter adjustment method based on high reflectivity clouds has achieved the expected goals. Customized operational parameters suitable for cloud inversion have been established, providing valuable reference and technical means for instrument operational parameter adjustment and long-term series monitoring calibration.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"345 ","pages":"Article 109582"},"PeriodicalIF":2.3,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144596582","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}

{"title":"The energy levels and Hyperfine structures constants for n = 2 states in boron-like ions","authors":"Bing-Bing Li ,&nbsp;Lei Wu ,&nbsp;Deng-Hong Zhang ,&nbsp;Chen-Zhong Dong ,&nbsp;Jun Jiang","doi":"10.1016/j.jqsrt.2025.109573","DOIUrl":"10.1016/j.jqsrt.2025.109573","url":null,"abstract":"<div><div>The atomic structure parameters of highly charged ions(HCIs) are of great importance in nuclear fusion research. L-shell ions of high-Z elements, such as boron-like ions, were used to diagnose these hot plasmas. The energy levels and hyperfine structures constants for the 1s²2s²2p, 1s²2s2p², and 1s²2p³ of boron-like ions with <span><math><mi>Z</mi></math></span>= 36, 39, 40, 46, 49, 56, 57 and 79 are calculated using the multiconfiguration Dirac–Hartree–Fock (MCDHF) method and Model quantum electrodynamics (QED) method. The contributions of the frequency independent and dependent Breit interactions, nuclear recoil effect, and QED effects are discussed in detail. We find that for energy level of low-lying states of low atomic number <span><math><mi>Z</mi></math></span> ions, the contribution of the Breit interactions comes mainly from frequency independent contributions. As <span><math><mi>Z</mi></math></span> increases, the frequency dependent corrections become important. Especially for <span><math><mrow><mn>2</mn><mi>s</mi><mn>2</mn><msup><mrow><mi>p</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span> <span><math><mrow><msup><mrow></mrow><mrow><mn>4</mn></mrow></msup><msub><mrow><mi>P</mi></mrow><mrow><mn>3</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></math></span> level, the corrections are more than 30% of the total Breit interactions.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"345 ","pages":"Article 109573"},"PeriodicalIF":2.3,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144581095","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}

{"title":"Multi-laboratory measurements of 12CH4 2ν3-band line parameters. Part I: Line intensities with relative combined standard uncertainties at the permille level","authors":"Zachary D. Reed ,&nbsp;Manfred Birk ,&nbsp;Yan Tan ,&nbsp;Christina E. Cecelski ,&nbsp;Christian Röske ,&nbsp;Georg Wagner ,&nbsp;Shui-Ming Hu ,&nbsp;David A. Long ,&nbsp;Rui-Heng Yin ,&nbsp;Joseph T. Hodges","doi":"10.1016/j.jqsrt.2025.109571","DOIUrl":"10.1016/j.jqsrt.2025.109571","url":null,"abstract":"<div><div>We present accurate transition intensities for the R(0) to R(10) manifolds of ¹²CH<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span> in the 2<span><math><msub><mrow><mi>ν</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span>-band tetradecad region based on independent cavity ring-down spectroscopy and Fourier Transform spectroscopy measurements from three laboratories. Two sets of experiments involved multi-spectrum fits to low-pressure spectra acquired at Doppler-limited conditions which greatly reduced complications from effects caused by collisional broadening and line mixing. In a third experiment, cavity ring-down spectroscopy measurements of lineshapes made at elevated pressures were used constrain residual collisional broadening effects in the low-pressure spectra, thereby improving measurement precision. Intensities are reported for manifolds and specified multiplets comprising blended transitions, as well as for individual transitions. Summation of the manifold and multiplet intensities agree at the permille level, whereas highly blended individual transitions agree at the several permille level. For measurements of methane, the intensities reported here will enable more accurate spectroscopic determinations of amount-of-substance, and will support progress in remote sensing missions and future refinements of its other spectroscopic parameters.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"345 ","pages":"Article 109571"},"PeriodicalIF":2.3,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622472","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}