Pub Date : 2026-03-01Epub Date: 2026-01-07DOI: 10.1016/j.jqsrt.2026.109813
Iouli E. Gordon, Robert J. Hargreaves
{"title":"Preface to the HITRAN 2024: HITRAN special issue to celebrate the scientific contributions of Dr. Laurence Rothman","authors":"Iouli E. Gordon, Robert J. Hargreaves","doi":"10.1016/j.jqsrt.2026.109813","DOIUrl":"10.1016/j.jqsrt.2026.109813","url":null,"abstract":"","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"352 ","pages":"Article 109813"},"PeriodicalIF":1.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145956757","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 : 2026-03-01Epub Date: 2025-12-02DOI: 10.1016/j.jqsrt.2025.109781
Ivan V. Tarabukin , Denis G. Poydashev , Leonid A. Surin
The hyperfine structure of the (para)-NH3–(ortho)-H2 van der Waals molecular complex has been observed and analyzed for the first time. The measurements of the pure rotational transitions were carried out in the frequency range of 75-190 GHz using a newly developed millimeter-wave jet spectrometer with a molecular beam aligned coaxially with the direction of millimeter-waves propagation. 14N nuclear quadrupole coupling constant of NH3, spin-spin and spin-rotation interaction constants of the two protons of the H2 molecule were determined for (para)-NH3–(ortho)-H2 in its ground Π state. The obtained parameters contain useful information about angular orientation of the NH3 and H2 monomers within the van der Waals complex and provide an additional tool for evaluating the quality of the NH3–H2 interaction potential. The latter determines the reliability of the calculated excitation and de-excitation rates of ammonia during collisions with hydrogen in the dense interstellar clouds.
{"title":"Rotational spectrum and hyperfine structure of the (para)-NH3–(ortho)-H2 van der Waals molecular complex","authors":"Ivan V. Tarabukin , Denis G. Poydashev , Leonid A. Surin","doi":"10.1016/j.jqsrt.2025.109781","DOIUrl":"10.1016/j.jqsrt.2025.109781","url":null,"abstract":"<div><div>The hyperfine structure of the (<em>para</em>)-NH<sub>3</sub>–(<em>ortho</em>)-H<sub>2</sub> van der Waals molecular complex has been observed and analyzed for the first time. The measurements of the pure rotational transitions were carried out in the frequency range of 75-190 GHz using a newly developed millimeter-wave jet spectrometer with a molecular beam aligned coaxially with the direction of millimeter-waves propagation. <sup>14</sup>N nuclear quadrupole coupling constant of NH<sub>3</sub>, spin-spin and spin-rotation interaction constants of the two protons of the H<sub>2</sub> molecule were determined for (<em>para</em>)-NH<sub>3</sub>–(<em>ortho</em>)-H<sub>2</sub> in its ground Π state. The obtained parameters contain useful information about angular orientation of the NH<sub>3</sub> and H<sub>2</sub> monomers within the van der Waals complex and provide an additional tool for evaluating the quality of the NH<sub>3</sub>–H<sub>2</sub> interaction potential. The latter determines the reliability of the calculated excitation and de-excitation rates of ammonia during collisions with hydrogen in the dense interstellar clouds.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109781"},"PeriodicalIF":1.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145657483","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 : 2026-03-01Epub Date: 2025-10-25DOI: 10.1016/j.jqsrt.2025.109717
Alexander Kokhanovsky , Lou-Anne Chevrollier , Adrien Wehrlé , Karl Segl , Sabine Chabrillat
We propose simple analytical equations for the modeling of clean and dusty flat glacier ice surfaces, which can be used to inversely derive the parameters of microstructure of flat bare glacier ice and snow using both ground – based and spaceborne observations of the hyperspectral solar reflectance. The retrievals are based on the asymptotic radiative transfer equations valid for the case of weak light absorption in the semi-infinite turbid medium. The light reflection at the air - ice and ice - air interfaces is fully accounted for. To demonstrate the validity of the approach, the derived equations are exemplarily applied to both ground – based and EnMAP satellite measurements over the Hardangerjøkulen glacier (Norway). A number of important parameters controlling spectral signatures of the snow and glacier ice surfaces have been derived. The ground-based measurements confirm that the theoretical formulation presented in this work can be used to represent the solar light spectral reflectivity of glaciers. The application to satellite hyperspectral imagery shows that this novel technique allows for the determination of the glacier ice albedo (spectral, broadband) based on spaceborne glacier ice reflectance measurement. Additionally, the results demonstrate that not spectrally neutral soot but rather deposited atmospheric dust which enhances the absorption towards UV is responsible for the light absorption by snow for the case studied. Spatial distribution maps of ice grain diameter and dust concentration are derived over the glacier. These findings show that the analytical theory presented in this work can support further research on the characterization and monitoring of glaciers based on current and upcoming hyperspectral remote sensing satellite missions.
{"title":"A simple analytical model for the reflection function of flat glacier ice surfaces and its application for optical remote sensing of glaciers","authors":"Alexander Kokhanovsky , Lou-Anne Chevrollier , Adrien Wehrlé , Karl Segl , Sabine Chabrillat","doi":"10.1016/j.jqsrt.2025.109717","DOIUrl":"10.1016/j.jqsrt.2025.109717","url":null,"abstract":"<div><div>We propose simple analytical equations for the modeling of clean and dusty flat glacier ice surfaces, which can be used to inversely derive the parameters of microstructure of flat bare glacier ice and snow using both ground – based and spaceborne observations of the hyperspectral solar reflectance. The retrievals are based on the asymptotic radiative transfer equations valid for the case of weak light absorption in the semi-infinite turbid medium. The light reflection at the air - ice and ice - air interfaces is fully accounted for. To demonstrate the validity of the approach, the derived equations are exemplarily applied to both ground – based and EnMAP satellite measurements over the Hardangerjøkulen glacier (Norway). A number of important parameters controlling spectral signatures of the snow and glacier ice surfaces have been derived. The ground-based measurements confirm that the theoretical formulation presented in this work can be used to represent the solar light spectral reflectivity of glaciers. The application to satellite hyperspectral imagery shows that this novel technique allows for the determination of the glacier ice albedo (spectral, broadband) based on spaceborne glacier ice reflectance measurement. Additionally, the results demonstrate that not spectrally neutral soot but rather deposited atmospheric dust which enhances the absorption towards UV is responsible for the light absorption by snow for the case studied. Spatial distribution maps of ice grain diameter and dust concentration are derived over the glacier. These findings show that the analytical theory presented in this work can support further research on the characterization and monitoring of glaciers based on current and upcoming hyperspectral remote sensing satellite missions.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109717"},"PeriodicalIF":1.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145383154","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 : 2026-03-01Epub Date: 2026-01-20DOI: 10.1016/j.jqsrt.2026.109828
Prakash Gautam , Justin B. Maughan , Hans Moosmüller , Kurt Ehlers , Christopher M. Sorensen
{"title":"Corrigendum to “Study of Linear Depolarization Ratios Across a Wide Range of Scattering Angles for Particles of Diverse Sizes, Shapes, and Complex Refractive indices” [Journal of Quantitative Spectroscopy and Radiative Transfer, Volume 350, March 2026, 109761]","authors":"Prakash Gautam , Justin B. Maughan , Hans Moosmüller , Kurt Ehlers , Christopher M. Sorensen","doi":"10.1016/j.jqsrt.2026.109828","DOIUrl":"10.1016/j.jqsrt.2026.109828","url":null,"abstract":"","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"352 ","pages":"Article 109828"},"PeriodicalIF":1.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146014456","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 : 2026-03-01Epub Date: 2025-12-25DOI: 10.1016/j.jqsrt.2025.109801
Huai-Yi Xie
We investigate how the topological magneto-electric effect (TME) affects multiple resonances in the presence of a high permeability material (HPM)-plasmonic-coated topological insulator (TI) stratified sphere via applying the dyadic Green's functions (DGFs) incorporating layer-dependent relative permeability. Our focus is on how a HPM shell affects the TME-modified molecular decay rate spectrum of an emitting dipole in the vicinity of a HPM-metal-coated/metal-HPM-coated TI sphere. Our analysis reveals that for each multipolar resonance in the decay rate spectrum, the TME-induced red-shifts of the plasmonic bonding/antibonding mode and multiple magnetic-induced modes are explored. For a HPM-metal-coated TI sphere, the antibonding mode exhibits more significant TME-induced red-shifts than the bonding mode and the first magnetic-induced mode. In particular, the TME-induced red-shifts of the first magnetic-induced mode vanish when the HPM shell has a relative permeability of 500 and a thickness of 2 nm. In contrast, for a metal-HPM-coated TI sphere, the first magnetic-induced mode shows larger TME-induced red-shifted values than one for a HPM-metal-coated TI sphere. These phenomenological findings provide some useful guidance with experimenters to design realistic experiments for exploring possible unique TME signatures via utilizing some versatile HPM-plasmonic TI coreshell systems in their tunability of the multiple resonance modes.
{"title":"Topological magneto-electric effects for a high permeability material-plasmonic-coated topological insulator stratified sphere","authors":"Huai-Yi Xie","doi":"10.1016/j.jqsrt.2025.109801","DOIUrl":"10.1016/j.jqsrt.2025.109801","url":null,"abstract":"<div><div>We investigate how the topological magneto-electric effect (TME) affects multiple resonances in the presence of a high permeability material (HPM)-plasmonic-coated topological insulator (TI) stratified sphere via applying the dyadic Green's functions (DGFs) incorporating layer-dependent relative permeability. Our focus is on how a HPM shell affects the TME-modified molecular decay rate spectrum of an emitting dipole in the vicinity of a HPM-metal-coated/metal-HPM-coated TI sphere. Our analysis reveals that for each multipolar resonance in the decay rate spectrum, the TME-induced red-shifts of the plasmonic bonding/antibonding mode and multiple magnetic-induced modes are explored. For a HPM-metal-coated TI sphere, the antibonding mode exhibits more significant TME-induced red-shifts than the bonding mode and the first magnetic-induced mode. In particular, the TME-induced red-shifts of the first magnetic-induced mode vanish when the HPM shell has a relative permeability of 500 and a thickness of 2 nm. In contrast, for a metal-HPM-coated TI sphere, the first magnetic-induced mode shows larger TME-induced red-shifted values than one for a HPM-metal-coated TI sphere. These phenomenological findings provide some useful guidance with experimenters to design realistic experiments for exploring possible unique TME signatures via utilizing some versatile HPM-plasmonic TI coreshell systems in their tunability of the multiple resonance modes.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109801"},"PeriodicalIF":1.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145845041","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 : 2026-03-01Epub Date: 2026-01-09DOI: 10.1016/j.jqsrt.2026.109819
Renaud A.L. Vallée, Rénal Backov
Light transport in strongly scattering porous photocatalytic materials governs the spatial distribution of absorbed photons and therefore the generation of charge carriers driving photocatalytic reactions. Yet translating measured optical properties of such media into intrinsic reaction rate constants remains challenging, as it requires simultaneously accounting for multiple scattering, boundary losses, photochemical efficiency, and surface kinetics. Here we develop a compact analytical framework that unifies these processes for nanoparticle-loaded photocatalytic slabs. Using a finite-slab diffusion model with extrapolated boundaries, we derive closed-form expressions for the fluence field and couple them to a photochemical quantum efficiency and first-order surface kinetics. The resulting predictors yield intrinsic volumetric and areal rate constants whose dependence on the transport mean free path, optical thickness, and surface-to-volume ratio emerges transparently.
Validation against Monte-Carlo photon-migration simulations shows that the diffusion approximation reproduces the fluence and generation-rate profiles with a modest multiplicative mismatch, typically within a factor of 1.20–1.39, depending on the anisotropy and scattering phase function. This level of agreement is consistent with the known limits of the diffusion approximation and is sufficient to enable reliable, design-oriented predictions.
The analytical descriptors introduced here – such as , , and the extrapolation length – are general, physically interpretable, and directly integrable into data-driven optimisation and geometry-engineered reactor design. The framework thus provides a versatile and physically grounded tool for photocatalytic systems across diverse applications, including VOC photo-degradation, indoor air purification, and solar-fuel production.
{"title":"From light diffusion to photocatalytic rates: Compact scaling laws for strongly scattering porous slabs","authors":"Renaud A.L. Vallée, Rénal Backov","doi":"10.1016/j.jqsrt.2026.109819","DOIUrl":"10.1016/j.jqsrt.2026.109819","url":null,"abstract":"<div><div>Light transport in strongly scattering porous photocatalytic materials governs the spatial distribution of absorbed photons and therefore the generation of charge carriers driving photocatalytic reactions. Yet translating measured optical properties of such media into intrinsic reaction rate constants remains challenging, as it requires simultaneously accounting for multiple scattering, boundary losses, photochemical efficiency, and surface kinetics. Here we develop a compact analytical framework that unifies these processes for nanoparticle-loaded photocatalytic slabs. Using a finite-slab diffusion model with extrapolated boundaries, we derive closed-form expressions for the fluence field and couple them to a photochemical quantum efficiency and first-order surface kinetics. The resulting predictors yield intrinsic volumetric and areal rate constants whose dependence on the transport mean free path, optical thickness, and surface-to-volume ratio emerges transparently.</div><div>Validation against Monte-Carlo photon-migration simulations shows that the diffusion approximation reproduces the fluence and generation-rate profiles with a modest multiplicative mismatch, typically within a factor of <span><math><mo>∼</mo></math></span>1.20–1.39, depending on the anisotropy and scattering phase function. This level of agreement is consistent with the known limits of the diffusion approximation and is sufficient to enable reliable, design-oriented predictions.</div><div>The analytical descriptors introduced here – such as <span><math><msup><mrow><mi>ℓ</mi></mrow><mrow><mo>∗</mo></mrow></msup></math></span>, <span><math><mrow><mi>S</mi><mo>/</mo><mi>V</mi></mrow></math></span>, and the extrapolation length <span><math><msub><mrow><mi>z</mi></mrow><mrow><mi>b</mi></mrow></msub></math></span> – are general, physically interpretable, and directly integrable into data-driven optimisation and geometry-engineered reactor design. The framework thus provides a versatile and physically grounded tool for photocatalytic systems across diverse applications, including VOC photo-degradation, indoor air purification, and solar-fuel production.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"352 ","pages":"Article 109819"},"PeriodicalIF":1.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145956754","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 : 2026-03-01Epub Date: 2026-01-08DOI: 10.1016/j.jqsrt.2026.109814
Tianjiao Li , Dong Liu
The precise three-dimensional temperature distribution measurement in large-scale furnaces is crucial for industrial efficiency and safety, yet remains challenging due to the inherent ill-posedness and complex radiative properties of flames. This study presents a multi-spectral light field imaging (MSLFI) model based on the backward Monte Carlo method, enabling simultaneous imaging of both flame and furnace wall in a single snapshot. By integrating simultaneous iterative and algebraic reconstruction techniques, particularly the Simultaneous Algebraic Reconstruction Technique (SART), our method achieves robust temperature distribution reconstruction. A thorough assessment of imaging accuracy and reconstruction uncertainties is performed, considering microlens array configuration, flame voxel resolution, ray density, flame absorption and scattering properties, wall reflection, spatial resolution, and signal-to-noise ratio. Results indicate that flame absorption properties exert the most significant influence on reconstruction fidelity, followed by scattering properties, wall reflection, spatial resolution, and signal-to-noise ratio, while microlens array configuration, flame voxel resolution and ray density have minimal impact on the accuracy of temperature distribution reconstruction. The proposed approach offers a practical, efficient solution for industrial furnace monitoring and advances the state-of-the-art in non-invasive, high-resolution temperature imaging for combustion systems.
{"title":"Determination and uncertainty analysis of three-dimensional temperature distribution of non-uniform flame using multi-spectral light field imaging based on backward Monte Carlo method","authors":"Tianjiao Li , Dong Liu","doi":"10.1016/j.jqsrt.2026.109814","DOIUrl":"10.1016/j.jqsrt.2026.109814","url":null,"abstract":"<div><div>The precise three-dimensional temperature distribution measurement in large-scale furnaces is crucial for industrial efficiency and safety, yet remains challenging due to the inherent ill-posedness and complex radiative properties of flames. This study presents a multi-spectral light field imaging (MSLFI) model based on the backward Monte Carlo method, enabling simultaneous imaging of both flame and furnace wall in a single snapshot. By integrating simultaneous iterative and algebraic reconstruction techniques, particularly the Simultaneous Algebraic Reconstruction Technique (SART), our method achieves robust temperature distribution reconstruction. A thorough assessment of imaging accuracy and reconstruction uncertainties is performed, considering microlens array configuration, flame voxel resolution, ray density, flame absorption and scattering properties, wall reflection, spatial resolution, and signal-to-noise ratio. Results indicate that flame absorption properties exert the most significant influence on reconstruction fidelity, followed by scattering properties, wall reflection, spatial resolution, and signal-to-noise ratio, while microlens array configuration, flame voxel resolution and ray density have minimal impact on the accuracy of temperature distribution reconstruction. The proposed approach offers a practical, efficient solution for industrial furnace monitoring and advances the state-of-the-art in non-invasive, high-resolution temperature imaging for combustion systems.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"352 ","pages":"Article 109814"},"PeriodicalIF":1.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145956903","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 : 2026-03-01Epub Date: 2025-11-29DOI: 10.1016/j.jqsrt.2025.109778
Rolf Buhler, Philippe Deverchère, Christophe Plotard, Sébastien Vauclair
Artificial Light At Night (ALAN) has been increasing steadily over the past century, particularly during the last decade. This leads to rising light pollution, which is known to have adverse effects on living organisms, including humans. We present a new software package to model light pollution from ground radiance measurements. The software is called Otus 3 and incorporates innovative ALAN diffusion models with different atmospheric profiles, cloud covers and urban emission functions. To date, light pollution modelling typically focused on calculating the zenith luminance of the skyglow produced by city lights. In Otus 3 we extend this and additionally model the horizontal illuminance on the ground, including the contributions from skyglow and the direct illumination. We applied Otus 3 to France using ground radiance data from the Visible Infrared Imaging Radiometer Suite (VIIRS). We calibrated our models using precise sky brightness measurements we obtained over 6 years at 139 different locations and make this dataset publicly available. We produced the first artificial illuminance map for France for the periods of 2013–2018 and 2019–2024. We found that the artificial ground illuminance in the middle of the night decreased by 23% between these two periods, in stark contrast to the global trend.
{"title":"Multi-faceted light pollution modelling and its application to the decline of artificial illuminance in France","authors":"Rolf Buhler, Philippe Deverchère, Christophe Plotard, Sébastien Vauclair","doi":"10.1016/j.jqsrt.2025.109778","DOIUrl":"10.1016/j.jqsrt.2025.109778","url":null,"abstract":"<div><div>Artificial Light At Night (ALAN) has been increasing steadily over the past century, particularly during the last decade. This leads to rising light pollution, which is known to have adverse effects on living organisms, including humans. We present a new software package to model light pollution from ground radiance measurements. The software is called <em>Otus</em> 3 and incorporates innovative ALAN diffusion models with different atmospheric profiles, cloud covers and urban emission functions. To date, light pollution modelling typically focused on calculating the zenith luminance of the skyglow produced by city lights. In <em>Otus</em> 3 we extend this and additionally model the horizontal illuminance on the ground, including the contributions from skyglow and the direct illumination. We applied <em>Otus</em> 3 to France using ground radiance data from the Visible Infrared Imaging Radiometer Suite (VIIRS). We calibrated our models using precise sky brightness measurements we obtained over 6 years at 139 different locations and make this dataset publicly available. We produced the first artificial illuminance map for France for the periods of 2013–2018 and 2019–2024. We found that the artificial ground illuminance in the middle of the night decreased by 23% between these two periods, in stark contrast to the global trend.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109778"},"PeriodicalIF":1.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145613900","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}
A multiscale modeling approach is proposed to determine the normal spectral emissivity of a 1.92 mm thick and 98% dense cerium oxide ceramic containing a small amount of micron size pores. The model is based on measurements of the electrical conductivity of the ceramic for the thermal operating regime set by the actual solar thermochemical production of H, i.e. from 900 to 1500 °C at a oxygen partial pressure of 10−5 atm. From a radiative point of view, the ceramic is defined as the volumetric distribution of spherical pores in a set of grains forming a radiatively homogeneous and continuous matrix. Room temperature normal hemispherical reflectance and transmittance measurements give analytically the scattering coefficient of this absorbing and scattering medium, considered independent from the temperature, using the modified two-flux approximation. The absorption coefficient is given at a fixed temperature and atmosphere by a semi-quantum Drude-Lorentz model whose parameters are derived from electrical conductivity measurements. The combination of both coefficients allow to determine critical optical thickness of the sample depending on the temperature, and to model emissivity. The multiscale model predicts the increase of an emissivity plateau between 2500 and 20000 cm−1 with the temperature, going from 0.70 at 900 °C to 0.84 at 1500 °C, higher than the value of 0.20 measured at room temperature.
{"title":"Multiscale modeling of the high-temperature radiative properties of ceria ceramics under thermochemical redox conditions","authors":"Léo Gaillard , Pierre-Marie Geffroy , Abderezak Aouali , Benoit Rousseau","doi":"10.1016/j.jqsrt.2025.109783","DOIUrl":"10.1016/j.jqsrt.2025.109783","url":null,"abstract":"<div><div>A multiscale modeling approach is proposed to determine the normal spectral emissivity of a 1.92 mm thick and 98% dense cerium oxide ceramic containing a small amount of micron size pores. The model is based on measurements of the electrical conductivity of the ceramic for the thermal operating regime set by the actual solar thermochemical production of H<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>, i.e. from 900 to 1500 °C at a oxygen partial pressure of 10<sup>−5</sup> atm. From a radiative point of view, the ceramic is defined as the volumetric distribution of spherical pores in a set of grains forming a radiatively homogeneous and continuous matrix. Room temperature normal hemispherical reflectance and transmittance measurements give analytically the scattering coefficient of this absorbing and scattering medium, considered independent from the temperature, using the modified two-flux approximation. The absorption coefficient is given at a fixed temperature and atmosphere by a semi-quantum Drude-Lorentz model whose parameters are derived from electrical conductivity measurements. The combination of both coefficients allow to determine critical optical thickness of the sample depending on the temperature, and to model emissivity. The multiscale model predicts the increase of an emissivity plateau between 2500 and 20000 cm<sup>−1</sup> with the temperature, going from 0.70 at 900 °C to 0.84 at 1500 °C, higher than the value of 0.20 measured at room temperature.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"351 ","pages":"Article 109783"},"PeriodicalIF":1.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145689301","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}
Three-step three colour resonance ionization spectroscopy is employed in a linear time of flight mass spectrometer to investigate the autoionization spectra of atomic lutetium in the energy range 47360 - 53200 cm-1 above ground level. Using two-step excitation, Lu I atoms in ground / first meta-stable level are transferred to highly excited intermediate levels at ∼ 4 eV above the ground level and third laser is scanned to explore autoionization resonances connecting from the intermediate level. Total 71 odd-parity autoionization levels including 21 new levels are observed.
{"title":"New odd parity autoionization levels of Lu I by three-step three colour RIMS","authors":"Diptimayee Biswal , Laxmi priya Meher , Vipul Kumar , D.R. Rathod , Asawari D. Rath , Sanjay Sethi","doi":"10.1016/j.jqsrt.2025.109749","DOIUrl":"10.1016/j.jqsrt.2025.109749","url":null,"abstract":"<div><div>Three-step three colour resonance ionization spectroscopy is employed in a linear time of flight mass spectrometer to investigate the autoionization spectra of atomic lutetium in the energy range 47360 - 53200 cm<sup>-</sup><sup>1</sup> above ground level. Using two-step excitation, Lu I atoms in ground / first meta-stable level are transferred to highly excited intermediate levels at ∼ 4 eV above the ground level and third laser is scanned to explore autoionization resonances connecting from the intermediate level. Total 71 odd-parity autoionization levels including 21 new levels are observed.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"350 ","pages":"Article 109749"},"PeriodicalIF":1.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145531873","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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