Journal of Quantitative Spectroscopy & Radiative Transfer最新文献

{"title":"Two-step method for calculating normal reflectance of snow under oblique solar illumination","authors":"Leonid A. Dombrovsky ,&nbsp;Jixun Sun ,&nbsp;Junming Zhao","doi":"10.1016/j.jqsrt.2025.109659","DOIUrl":"10.1016/j.jqsrt.2025.109659","url":null,"abstract":"<div><div>The suggested method is developed for weakly absorbing and highly scattering media such as snow in the visible and shortwave infrared ranges. The multiple scattering of solar radiation is favorable for the transport approximation to determine the source function of the radiative transfer equation (RTE). This source function does not depend on angular coordinates, and the resulting RTE can be easily integrated along an arbitrary direction at the second step of the problem solution. The spectral calculations of the normal reflectance of snow cover of different thicknesses under oblique solar illumination are compared with a numerical reference solution. It is shown that the approximate two-step method is sufficiently accurate for use in practical applications. Computational analysis indicates that the reflectance value depends only on the optical properties of the snow surface layer, the thickness of which decreases strongly with increasing radiation wavelength. It is proposed that the equivalent radius of snow grains or another parameter of the optical model of snow be determined from measurements of albedo maxima in the near-infrared.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"347 ","pages":"Article 109659"},"PeriodicalIF":1.9,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145045284","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":"A novel spectroscopic design toward the measurement of electron’s electric dipole moment using lead monofluoride","authors":"Zesen Wang ,&nbsp;Renjun Pang ,&nbsp;Jie Ma ,&nbsp;Qinning Lin ,&nbsp;Yabing Ji ,&nbsp;Shunyong Hou ,&nbsp;Xiaohu Li ,&nbsp;Liang Xu ,&nbsp;Xingjia Li ,&nbsp;Guanglong Chen ,&nbsp;Zhenghai Yang ,&nbsp;Jianping Yin ,&nbsp;Tao Yang","doi":"10.1016/j.jqsrt.2025.109658","DOIUrl":"10.1016/j.jqsrt.2025.109658","url":null,"abstract":"<div><div>The search for the electron’s electric dipole moment (eEDM) has long been pursued to explore the new physics beyond the Standard Model. To date, the most stringent constraints on the eEDM measurement were imposed by paramagnetic polar diatomic molecules/molecular ions through probing the changes of the precession rate of electron spins in an electric field, although nonzero eEDM has not been reported yet. In this study, we propose a novel design of spectroscopic detection in the lead monofluoride (²⁰⁸Pb¹⁹F) molecule that can take full advantage of its long coherent ground state, low Landé <em>g</em> factor, strong internal electric field, and unique field-dependent eEDM sensitive transition. Adopting an effective Hamiltonian approach, we untangle the complicated <em>J</em>-mixing energy level structure of the coherent ground state <em>X</em>₁²Π_1/2(<em>υ</em> = 0, <em>J</em> = 1/2, <em>e, F</em> = 1, |<em>M_F</em>| = 1), and characterize the rotational branching ratios in the <em>A</em>²Σ_1/2(<em>υ</em>′ = 0) ← <em>X</em>₁²Π_1/2(<em>υ</em> = 0) detection scheme. We demonstrate the highly asymmetric branching ratios in the Σ←Π transition which permits the preparation of coherently mixed states, followed by the simulated Stark spectroscopy under the externally applied electric field to address the sensitive transition <em>Q_fe</em>(1/2) for the eEDM measurement. In the end, we discuss the feasibility of laser cooling and Stark deceleration of PbF molecules. Our detection scheme will support us in constructing a fully optical approach toward the eEDM measurement using PbF molecules, which can enrich the molecular pool that explores the fundamental physics on a table-top apparatus.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"347 ","pages":"Article 109658"},"PeriodicalIF":1.9,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145219775","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":"Term energy analysis of iron monohydride (FeH)","authors":"T.E. Blackmore,&nbsp;D.W. Tokaryk","doi":"10.1016/j.jqsrt.2025.109650","DOIUrl":"10.1016/j.jqsrt.2025.109650","url":null,"abstract":"<div><div>MARVEL software was used to perform a global fit on all FeH transitions available in the literature to create an optimized and comprehensive term energy list. The diverse types of data, data sources, and electronic transitions that were used for this fit are organized and tabulated. To improve the fit, inconsistencies in the F <span><math><mrow><msup><mrow></mrow><mrow><mn>4</mn></mrow></msup><msub><mrow><mi>Δ</mi></mrow><mrow></mrow></msub></mrow></math></span> <span><math><msub><mrow></mrow><mrow></mrow></msub></math></span>-X <span><math><mrow><msup><mrow></mrow><mrow><mn>4</mn></mrow></msup><msub><mrow><mi>Δ</mi></mrow><mrow></mrow></msub></mrow></math></span> <span><math><msub><mrow></mrow><mrow></mrow></msub></math></span> analysis published in 1987 were fixed using modern computation and visualization techniques. F <span><math><mrow><msup><mrow></mrow><mrow><mn>4</mn></mrow></msup><msub><mrow><mi>Δ</mi></mrow><mrow></mrow></msub></mrow></math></span> <span><math><msub><mrow></mrow><mrow></mrow></msub></math></span>-A <span><math><mrow><msup><mrow></mrow><mrow><mn>4</mn></mrow></msup><msub><mrow><mi>Π</mi></mrow><mrow></mrow></msub></mrow></math></span> <span><math><msub><mrow></mrow><mrow></mrow></msub></math></span> transitions were identified in spectra published in the Kitt Peak archive and added to the fit. Also, several laser excitation and Fourier transform spectrometer measurements taken in our lab were added, including those from the newly discovered I <span><math><mrow><msup><mrow></mrow><mrow><mn>4</mn></mrow></msup><msub><mrow><mi>Φ</mi></mrow><mrow></mrow></msub></mrow></math></span> electronic state. The final term energy list and transition list are given in the supplementary material.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"347 ","pages":"Article 109650"},"PeriodicalIF":1.9,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145103968","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 spectra of Cd ions with the 4dk ground state configuration: Cd X","authors":"A.N. Ryabtsev,&nbsp;E.Y. Kononov","doi":"10.1016/j.jqsrt.2025.109657","DOIUrl":"10.1016/j.jqsrt.2025.109657","url":null,"abstract":"<div><div>The spectrum of the Cd⁺⁹ ion excited in a vacuum spark and recorded with high resolution was studied in the range 146 - 205 Å. 112 spectral lines of the 4p⁶4d³ − (4p⁶4d²5p + 4p⁶4d²4f + 4p⁵4d⁴) transitions were identified for the first time. All but one energy levels of the ground term configuration 4p⁶4d³ were established and 65 levels in the 4p⁶4d²5p + 4p⁶4d²4f + 4p⁵4d⁴ configurations were found.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"347 ","pages":"Article 109657"},"PeriodicalIF":1.9,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145045285","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 vacuum ultraviolet photoabsorption spectroscopy of 1-Bromo-2,2-Difluoroethylene (BrHC=CF2). A joint experimental and quantum chemical investigation","authors":"R. Locht ,&nbsp;C. Kune","doi":"10.1016/j.jqsrt.2025.109654","DOIUrl":"10.1016/j.jqsrt.2025.109654","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The vacuum UV photoabsorption spectrum of 1-bromo-2,2-difluoro-ethylene has been observed using synchrotron radiation. It is measured and analyzed between 5 eV (40300 cm&lt;sup&gt;-1&lt;/sup&gt;) and 15 eV (121000 cm&lt;sup&gt;-1&lt;/sup&gt;) for the first time. Several very weak features are observed at low photon energy, between 5.0 eV and 6.5 eV, and assigned to valence transitions. To support the assignment of these features, quantum chemical calculations have been performed on the excitation energies of the neutral states of BrHC=CF&lt;sub&gt;2&lt;/sub&gt;. The characteristic π&lt;sub&gt;CC&lt;/sub&gt;(4a”)→π&lt;sub&gt;CC&lt;/sub&gt;*(a”) valence transition for the ethylene derivatives is observed at 6.955 eV. The detected vibrational structure is assigned to &lt;span&gt;ν&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt; (C=C stretching) and &lt;span&gt;ν&lt;/span&gt;&lt;sub&gt;6&lt;/sub&gt; (C-Br stretching) vibrations with vibrational wavenumbers ω&lt;sub&gt;2&lt;/sub&gt;=1550±60 cm&lt;sup&gt;-1&lt;/sup&gt; (192±7 meV) and ω&lt;sub&gt;6&lt;/sub&gt;=790±60 cm&lt;sup&gt;-1&lt;/sup&gt; (98±7 meV). Between 7.4 eV and 9.8 eV numerous weak but sharp transitions are observed, classified and assigned to π&lt;sub&gt;CC&lt;/sub&gt;(4a”)→npλ (n=5-10, λ=0,1) and nd (n=4-7) Rydberg transitions converging to IE&lt;sub&gt;ad&lt;/sub&gt;(&lt;span&gt;&lt;math&gt;&lt;mover&gt;&lt;mi&gt;X&lt;/mi&gt;&lt;mo&gt;˜&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;&lt;/span&gt;&lt;sup&gt;2&lt;/sup&gt;A\")=9.695 eV [&lt;span&gt;&lt;span&gt;5&lt;/span&gt;&lt;/span&gt;]. Their vibrational structure has been analyzed and assigned to &lt;span&gt;ν&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt; (C=C stretching), &lt;span&gt;ν&lt;/span&gt;&lt;sub&gt;6&lt;/sub&gt; (C-Br stretching) and &lt;span&gt;ν&lt;/span&gt;&lt;sub&gt;8&lt;/sub&gt; (CF&lt;sub&gt;2&lt;/sub&gt; rocking) vibrational normal modes. Averaging over all the npλ and nd Rydberg states, the vibrational wavenumbers &lt;span&gt;&lt;math&gt;&lt;mover&gt;&lt;mi&gt;ω&lt;/mi&gt;&lt;mo&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;= 1520±20 cm&lt;sup&gt;-1&lt;/sup&gt; (188±3 meV), &lt;span&gt;&lt;math&gt;&lt;mover&gt;&lt;mi&gt;ω&lt;/mi&gt;&lt;mo&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;&lt;/span&gt;&lt;sub&gt;6&lt;/sub&gt;=770±20 cm&lt;sup&gt;-1&lt;/sup&gt; (95±3 meV) and &lt;span&gt;&lt;math&gt;&lt;mover&gt;&lt;mi&gt;ω&lt;/mi&gt;&lt;mo&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;&lt;/span&gt;&lt;sub&gt;8&lt;/sub&gt;=363±20 cm&lt;sup&gt;-1&lt;/sup&gt; (45±3 meV) are obtained. The 9.2 eV to 11.0 eV region is dominated by strong and sharp Rydberg transitions converging to IE&lt;sub&gt;ad&lt;/sub&gt;(&lt;span&gt;&lt;math&gt;&lt;mover&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;mo&gt;˜&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;&lt;/span&gt;&lt;sup&gt;2&lt;/sup&gt;A’)=11.362 eV [&lt;span&gt;&lt;span&gt;5&lt;/span&gt;&lt;/span&gt;]. Transitions from n&lt;sub&gt;Br&lt;/sub&gt;(11a’)→ns (n=5-9), np (n=5-9) and ndλ (n=4-9, λ=0,1) are observed. Their analysis shows the excitation of &lt;span&gt;ν&lt;/span&gt;&lt;sub&gt;4&lt;/sub&gt; (C-F symmetric stretching) and &lt;span&gt;ν&lt;/span&gt;&lt;sub&gt;8&lt;/sub&gt; (CF&lt;sub&gt;2&lt;/sub&gt; rocking) vibrational normal modes. These are characterized by averaged vibrational wavenumbers&lt;span&gt;&lt;math&gt;&lt;mover&gt;&lt;mi&gt;ω&lt;/mi&gt;&lt;mo&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;&lt;/span&gt;&lt;sub&gt;4&lt;/sub&gt;=1125±40 cm&lt;sup&gt;-1&lt;/sup&gt; (139±5 meV) and &lt;span&gt;&lt;math&gt;&lt;mover&gt;&lt;mi&gt;ω&lt;/mi&gt;&lt;mo&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;&lt;/span&gt;&lt;sub&gt;8&lt;/sub&gt;=366±40 cm&lt;sup&gt;-1&lt;/sup&gt; (45±5 meV). Above 11.0 eV and up to 15.0 eV sharp strong absorption is followed by long series of weak modulations superimposed on strong broad bands. An analysis and interpretations of these features have been attempted in terms of Rydberg transitions converging to the successive v","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"347 ","pages":"Article 109654"},"PeriodicalIF":1.9,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145045286","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":"Analysis of a non-LTE hypersonic spectrum of methane between 5880 and 6220 cm−1","authors":"Lyam Rolland ,&nbsp;Eszter Dudás ,&nbsp;Nicolas Suas-David ,&nbsp;Michaël Rey ,&nbsp;Samir Kassi ,&nbsp;Andrei V. Nikitin ,&nbsp;Robert Georges","doi":"10.1016/j.jqsrt.2025.109656","DOIUrl":"10.1016/j.jqsrt.2025.109656","url":null,"abstract":"<div><div>The SMAUG device is used to thermally populate the vibrational states of the methane molecule and depopulate its rotational states through its supersonic expansion in argon. The methane molecule is probed during expansion by cavity ringdown spectroscopy (CRDS) between 5880 and 6220 cm⁻¹. The laser beam passes through both the isentropic core of the flow, characterized by a very low rotational temperature of 40.4 ± 0.8 K, and the hotter boundary layers surrounding it, which are characterized by an average rotational temperature of 364.3 ± 7.7 K. Analysis of the spectrum reveals that the vibrational population does not follow a Boltzmann distribution. A special procedure is developed to assign an effective vibrational temperature to each vibrational state, ranging from 532.4 ± 32.2 to 1112.0 ± 81.7 K for molecules in the isentropic core, and from 811.6 ± 43.1 to 851.8 ± 45.6 K for those in the shear layer. Only the first vibrational states of each methane polyad remain significantly populated leading to detectable transitions. A total of 2525 transitions from the cold gas of the isentropic core and from the warmer gas of the boundary layers are assigned from a new <em>ab initio</em> effective model and 1000 are confirmed by lower state combination differences (LSCD). Among these transitions, 718 originates from cold bands and 1807 from hot bands starting from vibrational states ν₄, ν₂ (dyad), 2ν₄ (pentad) and 3ν₄ (octad).</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"347 ","pages":"Article 109656"},"PeriodicalIF":1.9,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145026724","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 12CH42ν3-band line parameters. Part II: Spectrum analysis based on the speed dependent Voigt profile with first-order line mixing","authors":"R.-H. Yin ,&nbsp;J.-K. Li ,&nbsp;J. Wang ,&nbsp;A.-W. Liu ,&nbsp;Z.D. Reed ,&nbsp;J.T. Hodges ,&nbsp;M. Birk ,&nbsp;Y. Tan ,&nbsp;S.-M. Hu","doi":"10.1016/j.jqsrt.2025.109588","DOIUrl":"10.1016/j.jqsrt.2025.109588","url":null,"abstract":"<div><div>Methane (CH<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span>), the second most important greenhouse gas, playing a critical role in atmospheric monitoring for global climate change research. The 1.64 <span><math><mrow><mi>μ</mi><mi>m</mi></mrow></math></span> spectral region (6050–6250 cm⁻¹), corresponding to the 2<span><math><msub><mrow><mi>ν</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span> vibrational band of methane, is particularly advantageous for remote sensing due to its strong absorption features and minimal interference from water vapor. As a result, wavelengths within this band correspond to a primary detection region for satellite missions such as MERLIN and GOSAT-2. However, current uncertainties in the HITRAN database — particularly in the line-shape parameters of strong lines within the 2<span><math><msub><mrow><mi>ν</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span> band where discrepancies of 5%–10% persist, limit the precision of atmospheric concentration retrievals. To address this challenge, we employ optical-frequency-comb-referenced cavity ring-down spectroscopy measurements of N<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>-broadened methane samples analyzed with the speed-dependent Voigt profile and first-order line mixing. This study provides line-shape parameters line mixing coefficients for the <span><math><mrow><mn>2</mn><msub><mrow><mi>ν</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span> band transitions from R(0) to R(10) at pressures between 10 and 50 kPa. Air-broadened values for these quantities based on scaling rules are also presented for atmospheric applications. Our measurements achieve relative uncertainties of less than 1 %, thereby significantly improving upon prior data archived in the HITRAN2020 database. These results provide essential experimental benchmarks for refining methane spectral databases, thereby enhancing the accuracy of satellite remote sensing and ground-based observations.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"346 ","pages":"Article 109588"},"PeriodicalIF":1.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145044609","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":"Mid-Infrared line intensity for the fundamental (1–0) vibrational band of carbon monoxide (CO)","authors":"D. Michelle Bailey ,&nbsp;Gar-Wing Truong ,&nbsp;Bradley D. Hall ,&nbsp;Andrew M. Crotwell ,&nbsp;Kimberly J. Harris ,&nbsp;Jennifer Carney ,&nbsp;Catherine Nguyen ,&nbsp;Seth B. Cataño-Lopez ,&nbsp;Lukas W. Perner ,&nbsp;Valentin J. Wittwer ,&nbsp;Thomas Südmeyer ,&nbsp;Oliver H. Heckl ,&nbsp;Joseph T. Hodges ,&nbsp;Garrett D. Cole ,&nbsp;Adam J. Fleisher","doi":"10.1016/j.jqsrt.2025.109652","DOIUrl":"10.1016/j.jqsrt.2025.109652","url":null,"abstract":"<div><div>Here we apply cavity ring-down spectroscopy to measure the intensity of a rotational-vibrational transition within the fundamental (1–0) vibrational band of carbon monoxide (CO). Laser measurements were made at a wavenumber near 2206 cm⁻¹ on a sample of CO-in-air with an amount fraction of χ_CO = 77.6 nmol mol⁻¹. High-precision cavity ring-down spectra were acquired using hybrid amorphous-crystalline mirrors to form the optical resonator and by application of simple and robust laser scanning and control techniques. With a relative combined standard uncertainty of <em>u_S</em> = 0.6 %, we report the R17 line intensity for the fundamental (1–0) vibrational band of ¹²C¹⁶O to be <em>S</em> = 1.028 × 10⁻¹⁹ cm⁻¹ molecule⁻¹ (isotopologue abundance, χ_iso = 100 %; temperature, <em>T</em> = 296 K), a value which differs from HITRAN2020 by a relative amount of 2.2 %.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"347 ","pages":"Article 109652"},"PeriodicalIF":1.9,"publicationDate":"2025-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145045371","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":"Radiative heat transfer simulation of inhomogeneous and non-gray medium based on FSCK and NCMCM","authors":"Bao-Hai Gao ,&nbsp;Jian Xiao ,&nbsp;Ming-Jian He ,&nbsp;Ya-Tao Ren ,&nbsp;Jun-Yan Liu ,&nbsp;Hong Qi","doi":"10.1016/j.jqsrt.2025.109651","DOIUrl":"10.1016/j.jqsrt.2025.109651","url":null,"abstract":"<div><div>The radiative heat transfer in high-temperature combustion systems is often non-negligible but challenging to simulate due to the complexity of solving the radiative transfer equation and the strong spectral selectivity and inhomogeneity. To overcome the above problems, a solution based on full-spectrum correlated k-distribution method (FSCK) and null-collision Monte Carlo method (NCMCM) is proposed in this paper. Compared to traditional photon Monte Carlo methods (PMCM), NCMCM can significantly reduce the tracking time in non-uniform media without affecting statistical results by introducing a null-collision event. By establishing the correlated assumption and using high-precision Gaussian quadrature scheme or random artificial spectral <em>g</em>-sampling method, FSCK can greatly reduce the number of solutions for the radiative transfer equation in non-uniform non-gray gases without losing spectral accuracy. The combination of FSCK and NCMCM can easily simulate radiative heat transfer in a non-uniform and non-grey media by merely introducing a non-gray stretching factor into the recorded blackbody radiation intensity. The computational accuracy and efficiency of two combination methods, FSCK/NCMCM and FSCK/PMCM, are evaluated through several typical cases. The results demonstrate that both FSCK/NCMCM with fixed artificial spectral <em>g</em>₀ sampling and FSCK/PMCM with random artificial spectral <em>g</em>₀ sampling achieve accuracy comparable to the benchmark method of LBL/NCMCM. FSCK/NCMCM exhibits stronger result stability for tracking more photon bundles per target element, while requiring only approximately half the computational time of FSCK/PMCM. Simultaneously, FSCK/NCMCM eliminates the process of pre-establishing and loading a <em>R</em>-<em>g</em>₀ database, thereby providing the advantage of lower memory overhead. Furthermore, when NCMCM and PMCM adopt identical random <em>g</em> sampling, the computational efficiency of FSCK/NCMCM proves to be several times higher than that of FSCK/PMCM.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"347 ","pages":"Article 109651"},"PeriodicalIF":1.9,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004379","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":"Pre-flight calibration of a multi-channel polarization remote sensor aerial polarimetric radiometer","authors":"Zhengdong Xu ,&nbsp;Pingping Yao ,&nbsp;Mengfan Li ,&nbsp;Xiangjing Wang ,&nbsp;Yanghao Chu ,&nbsp;Yadong Hu ,&nbsp;JieXiang Chen ,&nbsp;Jin Hong","doi":"10.1016/j.jqsrt.2025.109648","DOIUrl":"10.1016/j.jqsrt.2025.109648","url":null,"abstract":"<div><div>In optical remote sensing images, the primary contaminants comprise atmospheric aerosols, water vapor, clouds, and other atmospheric components, all of which significantly reduce the quantitative accuracy of parameters such as surface reflectance and modulation transfer function (MTF). To fulfill the application requirements for aerial image atmospheric correction, our approach involves simultaneously capturing multi-spectral polarized radiometric information across the visible, near-infrared, and short-wave infrared bands. This approach enables the retrieval of critical atmospheric parameters, such as aerosol and water vapor characteristics. We propose a system design for aerial atmospheric multi-angle polarization detection and develop an Aerial Polarized Radiometer accordingly. Firstly, we introduce the optical system design of the aerial polarized radiometer based on the theory of multi-aperture polarized light detection. To ensure accurate and timely collection of atmospheric spectral polarized radiometric information, with temporal synchronization and spatial correspondence in aerial atmospheric images, we design a multi-channel signal synchronous acquisition and transmission system based on aperture polarization detection. This system is capable of simultaneously capturing multi-channel spectral polarized detection information, effectively reducing the risks of pseudo-polarization phenomena and inconsistent detection targets across different bands that are often caused by asynchronous acquisition. Secondly, we elaborate on the design of the acquisition system and the acquisition timing of the dual Analog-to-Digital converters. The experimental results reveal that the stability error of the Aerial Polarized Radiometer in dark conditions is less than 0.1%. The signal-to-noise ratio of the Aerial Polarized Radiometer within its detection target range can reach 84 dB, while its non-linearity error is lower than 1%. The polarization detection accuracy is less than 0.16% within the range of 0.1∼0.3 linear polarization degree targets, satisfying the design specifications for aerial atmospheric polarization detection.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"347 ","pages":"Article 109648"},"PeriodicalIF":1.9,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144927883","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}