Journal of Quantitative Spectroscopy & Radiative Transfer最新文献

{"title":"Evaluating the scalar beam shape coefficients of Laguerre-Gauss beam using three methods and their relation","authors":"Mengyang Wang,&nbsp;Siqi Tang,&nbsp;Jianqi Shen","doi":"10.1016/j.jqsrt.2025.109548","DOIUrl":"10.1016/j.jqsrt.2025.109548","url":null,"abstract":"<div><div>Calculating the beam shape coefficients (BSCs) is crucial for analyzing the interaction between the Laguerre-Gaussian beams and the spherical particles. In this paper, the scalar BSCs of the Laguerre-Gaussian beam (LGB) are derived by using the finite series, the radial quadrature, and the angular spectrum decomposition methods. The relationships between the BSCs obtained with these methods are explored. It is found that under the paraxial conditions the expressions of the BSCs for the LGB may be transformed to each other. The study reveals the interconnection between these methods and may deepen the understanding of the beam-remodeling in the spherical wave expansion of the LGBs.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"345 ","pages":"Article 109548"},"PeriodicalIF":2.3,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144230324","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":"Experimental and theoretical investigation on N2 pressure-induced coefficients of the lowest rotational transitions of HCN","authors":"Francesca Tonolo ,&nbsp;Hubert J. Jóźwiak ,&nbsp;Luca Bizzocchi ,&nbsp;Mattia Melosso ,&nbsp;Piotr Wcisło ,&nbsp;François Lique ,&nbsp;Cristina Puzzarini","doi":"10.1016/j.jqsrt.2025.109521","DOIUrl":"10.1016/j.jqsrt.2025.109521","url":null,"abstract":"<div><div>We present the first experimental determination of room-temperature N₂ pressure broadening, speed dependent broadening, and pressure shift coefficients of the three lowest rotational lines of HCN. The experimental results served to assess the accuracy of a low-cost yet accurate computational strategy, which relies on a simplified characterization of the <figure><img></figure> interaction potential, and employs a novel approximate method of solving the quantum scattering problem. Building on the validation of this computational approach, the dataset was extended to higher rotational transitions, up to <span><math><mi>J</mi></math></span>(HCN)<span><math><mrow><mo>=</mo><mn>5</mn><mo>←</mo><mn>4</mn></mrow></math></span>. For these transitions, we provide the temperature dependence of the pressure broadening coefficient, its speed dependence parameter, and the Dicke narrowing parameter. This new dataset can support and refine the modeling of HCN in both the terrestrial and Titan’s atmospheres. This work constitutes an important step towards populating spectroscopic databases with accurate HCN line shape parameters.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"345 ","pages":"Article 109521"},"PeriodicalIF":2.3,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144254192","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":"Removing the evanescent waves from the finite series expression of the beam shape coefficients of the Gaussian beam: a study on the remodeling effects","authors":"Siqi Tang ,&nbsp;Leonardo A. Ambrosio ,&nbsp;Gérard Gouesbet ,&nbsp;Jianqi Shen","doi":"10.1016/j.jqsrt.2025.109544","DOIUrl":"10.1016/j.jqsrt.2025.109544","url":null,"abstract":"<div><div>This paper presents a reformulation of the finite series expressions for the beam shape coefficients (BSCs) of the Gaussian beam, distinctly separating the contributions from propagating and evanescent waves, these evanescent waves being associated with a blowing-up of the BSCs. By removing the contribution from evanescent waves, the blowing-up phenomenon is therefore eliminated. Additionally, the study investigates the beam remodeling effects of the finite series method. Unexpected far-field divergence along beam propagation and near-field oscillation structures are observed in numerical results. The analysis leads to a prediction that the finite series method inherently introduces a weak counter-propagating field component, which may account for the observed anomalies. These findings provide crucial insights for refining BSC-based beam remodeling and minimizing unphysical artifacts in practical applications.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"344 ","pages":"Article 109544"},"PeriodicalIF":2.3,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212538","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":"Theoretical performance limits of nonreciprocal thermophotovoltaic power generation for deep-space applications","authors":"Masato Suzuki ,&nbsp;Atsushi Sakurai","doi":"10.1016/j.jqsrt.2025.109542","DOIUrl":"10.1016/j.jqsrt.2025.109542","url":null,"abstract":"<div><div>Thermophotovoltaic (TPV) systems exhibit potential for generating electrical power in environments where sunlight is unavailable, such as in deep-space missions. However, the performance of conventional TPV systems that use reciprocal emitters and photovoltaic (PV) cells is limited by Kirchhoff’s law, which constrains the radiative exchange between the emitter and absorber. Nonreciprocal materials, which break the symmetry between absorption and emission, have recently been proposed to overcome this limitation and enhance energy transfer efficiency. In this study, we theoretically investigated the performance limits of a nonreciprocal TPV power generation system operating under cryogenic conditions in space environments. Our model comprised a two-layer thermoradiative (TR) emitter at high temperatures and two-layer PV cell at low temperatures, both employing idealized nonreciprocal materials. We derived the optimal operating conditions based on the generalized Planck’s law and calculated the maximum achievable power density and conversion efficiency for both reciprocal and nonreciprocal configurations. The results indicate that introducing nonreciprocity significantly improves the energy transfer between layers and increases the power output, particularly under large temperature differentials. Additionally, we evaluated the effect of multiple-cell stacking and demonstrated that nonreciprocal systems exhibited broader optimal bandgap distributions than their reciprocal counterparts. These findings suggest that nonreciprocal TPV systems offer a viable pathway for efficient power generation in deep-space missions.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"344 ","pages":"Article 109542"},"PeriodicalIF":2.3,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203080","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":"Phenomenon of glory and constraints it places on microphysics of aerosols in the atmosphere of Venus","authors":"Evgenij Zubko ,&nbsp;Yeon Joo Lee ,&nbsp;Atsushi Yamazaki","doi":"10.1016/j.jqsrt.2025.109522","DOIUrl":"10.1016/j.jqsrt.2025.109522","url":null,"abstract":"<div><div>We investigate the interrelation between the size distribution of sulfuric-acid droplets and the phenomenon of the glory surge on the phase function near backscattering, with special emphasis on photometric observations of Venus at λ = 0.365 μm. We use the Lorenz-Mie theory to compute light scattering by single spheres with a radius spanning the range from <em>r</em> = 0.01 μm up to 7.5 μm and apply a power-law size distribution <em>ñ</em>(<em>r</em>) ∝ <em>r</em>^-<em>ⁿ</em> to this polydisperse particle system. Our modeling reveals a weak dependence of the light-scattering response on the bottom limit of the power-law size distribution when it is set to be sufficiently small, <em>r</em>_min ≤ 0.1 μm. There is a straightforward interrelation between the upper limit <em>r</em>_max and the phase-angle location of the glory, which can be easily parameterized with a polynomial. The resulting interrelation can be used for immediate retrievals of <em>r</em>_max of aerosols in the atmosphere of Venus using observations of its glory phenomenon. We also show that the surge of the glory compared to that of the backscattering peak helps identify the chemical composition between water and sulfuric acid droplets remotely.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"345 ","pages":"Article 109522"},"PeriodicalIF":2.3,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240791","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":"Hyperfine structure of odd-parity configurations of the terbium atom, Part II: Levels with high J","authors":"B. Furmann,&nbsp;M. Klempka,&nbsp;S. Mieloch,&nbsp;D. Stefańska,&nbsp;P. Głowacki","doi":"10.1016/j.jqsrt.2025.109511","DOIUrl":"10.1016/j.jqsrt.2025.109511","url":null,"abstract":"<div><div>This work presents the results of measurements of the hyperfine structure for electronic levels belonging to odd-parity configurations of the terbium atom with high quantum number <span><math><mi>J</mi></math></span>. Laser spectroscopy with laser-induced fluorescence detection was used. The hyperfine structure of 80 terbium lines was recorded in three spectral regions. The hyperfine structure constants were determined for 47 levels with quantum number <span><math><mi>J</mi></math></span> values between 9/2 and 17/2.</div><div>Exactly 30 of those levels have not been studied so far; for the remaining 17 levels the precision of the constants was improved.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"344 ","pages":"Article 109511"},"PeriodicalIF":2.3,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184461","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":"Improved assessment of H216O transitions in the region 6600–7500 cm−1","authors":"Tibor Furtenbacher ,&nbsp;Scott C. Egbert ,&nbsp;Keeyoon Sung ,&nbsp;Sean C. Coburn ,&nbsp;Brian J. Drouin ,&nbsp;Gregory B. Rieker ,&nbsp;Attila G. Császár","doi":"10.1016/j.jqsrt.2025.109513","DOIUrl":"10.1016/j.jqsrt.2025.109513","url":null,"abstract":"<div><div>Due to the very large number of experimental, empirical, and computational studies addressing the rovibrational transitions and the underlying energy levels of the main isotopologue, H<span><math><msubsup><mrow></mrow><mrow><mn>2</mn></mrow><mrow><mspace></mspace><mn>16</mn></mrow></msubsup></math></span>O, of the water molecule, the room-temperature coverage offered by the canonical line-by-line spectroscopic database HITRAN2020 is almost complete, 99.87%, up to 6600 cm<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>. This study provides a detailed comparison of two recent datasets, one with measured line positions and intensities, obtained using a dual-comb spectrometer (DCS), from 6600 to 7500 cm<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> at temperatures up to 1300 K (neglecting the experimentally covered region of 7500–7650 cm<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> with noisy spectral features), and the other a composite empirical line list, called CW2024, covering the spectrum from the microwave to the ultraviolet. The aim has been the mutual validation of the two datasets, correction of possible errors in both of them, and providing additional validated experimental data for inclusion in line-by-line databases. At the end, 5419 transitions from the DCS measurement database were investigated with respect to those in the CW2024 line list, with the majority of the lines falling within the respective individual uncertainties of the two datasets. Using the composite empirical CW2024 database as a reference, 423 assignments were made for a subset of the 616 lines measured at high temperatures which are not part of HITRAN2020. Thus, in the region 6600–7500 cm<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> all but seven transitions, with intensities above a room-temperature cutoff of <span><math><mrow><mn>1</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>28</mn></mrow></msup></mrow></math></span> cm<!--> <!-->molecule⁻¹, have become experimentally known. In the Supplementary Material to this paper, an updated DCS database is provided, showcasing the improvements described in the article.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"344 ","pages":"Article 109513"},"PeriodicalIF":2.3,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195245","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 convolutional neural network technique for online tracking of the radius evolution of levitating evaporating microdroplets of pure liquids, liquid mixtures and suspensions","authors":"Kwasi Nyandey ,&nbsp;Gennadiy Derkachov ,&nbsp;Daniel Jakubczyk","doi":"10.1016/j.jqsrt.2025.109533","DOIUrl":"10.1016/j.jqsrt.2025.109533","url":null,"abstract":"<div><div>We have used convolutional neural network in a classification task to track the radius evolution of levitating evaporating microdroplets of pure diethylene glycol, diethylene glycol-water-polystyrene microparticles suspension, dipropylene glycol-water mixture and dipropylene glycol-water-silica nanoparticles suspension. We discretized a wider radii range into short radii segments, labeled them with class numbers and generated theoretical light scattering patterns from Mie theory. Then the network was trained on the theoretical images and used to classify unlabeled experimentally recorded Mie scattering patterns from the evaporating microdroplets. A plot of the class-average-radii versus the camera’s time step revealed the profile of the entire droplet radius evolution. We were able to work with ∼1500 classes and showed that the technique has the potential to distinguish droplet size difference of ±5 nm. We expect it to be applicable for online/real-time tracking of droplet evaporation.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"344 ","pages":"Article 109533"},"PeriodicalIF":2.3,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166404","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":"Continuously tunable multifunctional infrared smart thermal emitter based on phase-change material Ge2Sb2Te5","authors":"Xiang Song ,&nbsp;Yong Chen ,&nbsp;Xueying Xia","doi":"10.1016/j.jqsrt.2025.109535","DOIUrl":"10.1016/j.jqsrt.2025.109535","url":null,"abstract":"<div><div>As energy issues gain prominence, the technology of regulating thermal radiation through phase change materials has garnered significant attention. However, fabrication challenges and monofunctionality plague the current technologies. So, we suggest a three-layer thin-film metasurface structure made of the phase-change material Ge₂Sb₂Te₅(GST) and the metals Ge and Ag. This structure can change the emissivity in both directions at the atmospheric window and has excellent \"thermal switching\" properties for both releasing and keeping heat. We experimentally demonstrate that the structure can realize the radiative cooling and infrared thermal camouflage functions in the amorphous and crystalline states. In the amorphous phase, the device has an average emissivity of 0.081 in the mid-infrared band (3–5 µm) and 0.083 in the long-wave infrared band (8–13 µm). In the crystalline phase, it has an average emissivity of 0.632 in the mid-infrared band (3–5 µm) and 0.739 in the long-wave infrared band (8–13 µm). The effective medium theory shows that controlling the crystallization fraction can lead to continuous thermal variation that can encrypt information. The structure is a lithography-free thin film structure that exhibits robustness under incident light of different polarization angles and has large-scale and low-cost popularization value. This study provides an innovative approach for thin film structures to modulate thermal radiation for multifunctional applications, which are expected to be applied in the military, building energy efficiency, aerospace, and other fields.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"344 ","pages":"Article 109535"},"PeriodicalIF":2.3,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178794","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":"Emulation of radiation transport in 3D stochastic media using 1D planar Monte Carlo stochastic media radiation transport algorithms","authors":"Dominic Lioce ,&nbsp;Aaron J. Olson ,&nbsp;Anil K. Prinja","doi":"10.1016/j.jqsrt.2025.109507","DOIUrl":"10.1016/j.jqsrt.2025.109507","url":null,"abstract":"<div><div>A subset of stochastic media radiation transport problems involves those in which radiation is incident on a thin slab of stochastic material. Particle tracking in 3D for such problems is expensive, and 1D planar models lack accuracy because they only allow the material to change in one dimension. Therefore, we propose dimensional emulation, which through a slight modification allows existing 1D planar geometry stochastic media radiation transport models to reproduce results from the equivalent 3D models by allowing the material to change in all three dimensions, reproducing the fidelity of the 3D model for the low computational cost of the 1D planar model. In this work, we apply dimensional emulation to three Monte Carlo stochastic media radiation transport models: Chord Length Sampling (CLS), the Local Realization Preserving method (LRP), and a variant of Conditional Point Sampling (CoPS). For a common Markovian benchmark set, the 3D emulation variants of these algorithms are numerically verified to reproduce the results of the 3D variants within statistics while running 1.3 to 2 times faster in the implementation within Sandia National Laboratories open-source research code PlaybookMC. The 3D emulation variants are also shown to yield a 72%–92% reduction in error for the thin slab problems in comparison to the 1D benchmark. Finally, the 3D emulation variant of CLS and CoPS-1 are shown to reproduce 3D CLS results that were used to approximate results for a 3D spherical inclusion geometry benchmark set.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"345 ","pages":"Article 109507"},"PeriodicalIF":2.3,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144204457","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}