Journal of Quantitative Spectroscopy & Radiative Transfer最新文献

{"title":"Electronic structure, spectroscopic constants, and transition properties of NaC 0/+1/−1 diatomic species: An ab initio investigation","authors":"Yves Hassan Gouromsa ,&nbsp;Berthelot Saïd Duvalier Ramlina Vamhindi ,&nbsp;Mama Nsangou","doi":"10.1016/j.jqsrt.2024.109263","DOIUrl":"10.1016/j.jqsrt.2024.109263","url":null,"abstract":"<div><div>Diatomic species play a pivotal role in complex media, such as the interstellar and circumstellar media. Furthermore, there is a notable lack of information regarding NaC and its ions, NaC<span><math><msup><mrow></mrow><mrow><mo>+</mo></mrow></msup></math></span> and NaC<span><math><msup><mrow></mrow><mrow><mo>−</mo></mrow></msup></math></span>, despite the pervasiveness of the carbon element (C) and the validated role of Na-bearing molecules as organic reagents or in catalytic processes. In this study, ab initio multi-reference calculations, including core valence and complete basis set schemes, were employed to accurately determine the potential energy curves (PECs), dipole moment functions (DMFs) and transition dipole moments (TDMs) of ten, three and ten low-lying electronic states energies, respectively, for NaC, NaC<span><math><msup><mrow></mrow><mrow><mo>+</mo></mrow></msup></math></span> and NaC<span><math><msup><mrow></mrow><mrow><mo>−</mo></mrow></msup></math></span> diatomics species. The obtained results permitted the accurate determination of spectroscopic constants and vibrational transition properties, including vibrational level energies, Franck–Condon factors (FCFs), Einstein coefficients, absorption band oscillator strengths, vibrational transition energies and radiative lifetimes of allowed transitions. The predicted adiabatic ionisation energy value for NaC is 6.659 eV, while the vertical ionisation energy value is 6.676 eV. Similarly, the predicted adiabatic electron affinity value for NaC is 0.614 eV, while the vertical electron affinity value is 0.613 eV.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109263"},"PeriodicalIF":2.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696414","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":"Dielectronic satellite spectra from hollow He- and Li-like ion states in fluorine","authors":"A.S. Safronova,&nbsp;A. Stafford,&nbsp;U.I. Safronova","doi":"10.1016/j.jqsrt.2024.109272","DOIUrl":"10.1016/j.jqsrt.2024.109272","url":null,"abstract":"<div><div>About two decades ago, very unusual highly-resolved x-ray spectra were observed using a femtosecond laser-produced plasma that included a new type of satellite lines identified as being emitted from the autoionizing states of hollow ions (such as, for example, exotic KK hollow ions with the empty K shell). Though atomic structure calculations were able to predict the locations of such newly observed spectral features with reasonable precision, the relatively high intensity of these so-called hypersatellite lines, produced mainly in high-power laser plasmas, is far from being understood. The analysis of previous experiments with Teflon on the Leopard laser performed under different conditions related to laser pulse and contrast revealed the existence of KK hollow fluorine ions and motivated systematic theoretical studies of dielectronic satellite spectra from hollow ion states starting with He- and Li-like fluorine ions presented in this paper.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109272"},"PeriodicalIF":2.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696415","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 Lu I transition at 642 nm and its application to explore new odd parity autoionization resonances","authors":"Laxmi priya Meher ,&nbsp;Vipul Kumar ,&nbsp;Diptimayee Biswal ,&nbsp;Asawari D. Rath","doi":"10.1016/j.jqsrt.2024.109273","DOIUrl":"10.1016/j.jqsrt.2024.109273","url":null,"abstract":"<div><div>Resonance ionization mass spectroscopy using three-step photoionization (PI) schemes was employed to study the 642 nm transition of Lu I. Multimode tunable dye lasers were used in these studies to confirm the transition and further characterization of its hitherto unreported hyperfine structure. The hyperfine features of less abundant isotope ¹⁷⁶Lu and hyperfine A constant of upper level of 642 nm line and its transition isotope shift were determined for the first time. New autoionization resonances of odd parity connecting from the upper level of this transition were explored in the range 48315 – 50940 cm⁻¹.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109273"},"PeriodicalIF":2.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696413","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":"Isotopologue dependence of the CO2-air broadening and shifting coefficients: Experimental evidence and comparison with theory for 13CO2 and 12CO2","authors":"Didier Mondelain ,&nbsp;Alain Campargue ,&nbsp;Robert R. Gamache ,&nbsp;Jean-Michel Hartmann ,&nbsp;Fabien Gibert ,&nbsp;Georg Wagner ,&nbsp;Manfred Birk ,&nbsp;Christian Röske","doi":"10.1016/j.jqsrt.2024.109271","DOIUrl":"10.1016/j.jqsrt.2024.109271","url":null,"abstract":"<div><div>Fifteen transitions of the 20012-00001 band of ¹³CO₂ in air have been recorded at 296 K using a cavity ring-down spectrometer linked to an optical frequency comb referenced to a GPS-disciplined Rb oscillator. In parallel, measurements of ¹²CO₂ in air were made with a Fourier transform spectrometer for transitions belonging to the same 20012-00001 band, enabling comparison of the air-induced half-width and line shift coefficients of both isotopologues. For that, a multi-spectrum fit procedure is adopted with a Hartmann-Tran (HT) line profile. A decrease of about 0.4% is demonstrated for the ¹³CO₂ air-broadening coefficients compared to the corresponding values of the main isotopologue. To the best of our knowledge, this observation is the first experimental evidence of an isotopic effect on the air-broadening coefficients in CO₂ (which are generally assumed to be independent of the isotopologue in spectroscopic databases).</div><div>On the theoretical side, a refinement of the simple model described in [Lamouroux <em>et al.</em> JQSRT 111;2010:2321] is proposed which enables the determination of the air-broadening coefficients for the ¹³CO₂ isotopologue from the ¹²CO₂ values. In addition, complex Robert-Bonamy-Ma (CRBM) calculations have been performed for ¹²CO₂ and ¹³CO₂ in collision with N₂ or O₂ for the 20012-00001 band with <em>J</em>″ values from 0 to 85. From these CRBM data, the ¹³CO₂-air and ¹²CO₂-air half-width and line shift coefficients were computed and the obtained isotopologue effect on these parameters was compared to the experimental data. A good average agreement is achieved for the CRBM calculations for the air-broadening coefficients while the simple model leads to slightly smaller isotopic effects. In contrast, for the air-pressure shift coefficients, a quite large disagreement is observed between the calculations and the experimental data.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"333 ","pages":"Article 109271"},"PeriodicalIF":2.3,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150021","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 characterization of electronic structures and spin-orbit couplings in the diatomic sodium arsenide cation","authors":"Chang Wang,&nbsp;Yan Chen,&nbsp;Shan-Jun Chen,&nbsp;Song Li","doi":"10.1016/j.jqsrt.2024.109270","DOIUrl":"10.1016/j.jqsrt.2024.109270","url":null,"abstract":"<div><div>A high-level <em>ab initio</em> computation has been performed in order to determine the molecular structures, electronic characters and transition properties of a hitherto unknown diatomic cation of NaAs⁺. The electronic states associated with five dissociation channels, including both the Na⁺+As and Na+As⁺ limits, are subjected to detailed analysis. The results of the potential energy functions, spectroscopic constants and vibrational energy levels of the relevant states are presented herewith. The impact of the spin-orbit coupling effect on the low-lying electronic states is evaluated as well. Additionally, predictions of transition features, such as Einstein coefficients, Frank-Condon factors, and radiative lifetimes, are considered. It is concluded that the direct laser cooling of NaAs⁺ is infeasible.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109270"},"PeriodicalIF":2.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696416","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":"Automated design of nonreciprocal thermal emitters via Bayesian optimization","authors":"Bach Do ,&nbsp;Sina Jafari Ghalekohneh ,&nbsp;Taiwo Adebiyi ,&nbsp;Bo Zhao ,&nbsp;Ruda Zhang","doi":"10.1016/j.jqsrt.2024.109260","DOIUrl":"10.1016/j.jqsrt.2024.109260","url":null,"abstract":"<div><div>Nonreciprocal thermal emitters that break Kirchhoff’s law of thermal radiation promise exciting applications for thermal and energy applications. The design of the bandwidth and angular range of the nonreciprocal effect, which directly affects the performance of nonreciprocal emitters, typically relies on physical intuition. In this study, we present a general numerical approach to maximize the nonreciprocal effect. We choose doped magneto-optic materials and magnetic Weyl semimetal materials as model materials and focus on pattern-free multilayer structures. The optimization randomly starts from a less effective structure and incrementally improves the broadband nonreciprocity through the combination of Bayesian optimization and reparameterization. Optimization results show that the proposed approach can discover structures that can achieve broadband nonreciprocal emission at wavelengths from 5 to 40 μm using only a fewer layers, significantly outperforming current state-of-the-art designs based on intuition in terms of both performance and simplicity.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109260"},"PeriodicalIF":2.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696417","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":"Correlation of aerosol particles with clouds and radiation budget over the horn of Africa–Ethiopia using MODIS satellite data: Part 02","authors":"Ambachew Abeje Alemu ,&nbsp;Jaya Prakash Raju","doi":"10.1016/j.jqsrt.2024.109261","DOIUrl":"10.1016/j.jqsrt.2024.109261","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The aerosol particles are positively associated with the cloud parameters, precipitation and radiation budgets. The correlations of the aerosols-clouds-precipitations interaction ACPI are uncertain, that show large spatiotemporal variability in their magnitude. For this study, the aerosol particles and clouds data were retrieved from the Moderate Resolution Imaging Spectroradiometer MODIS sensors. These comprized of aerosol optical depth AOD, Ångström exponential AET, atmospheric water vapor AWV, mean cloud fraction CFM, cloud top pressure CTP and cloud top temperature CTT. The precipitation PPT data is comprized of 3B43 monthly products sourced from Tropical Rainfall Measuring Mission TRMM and the outgoing long-wave radiation OLR flux is comprized of Clouds and the Earth‘s Radiant Energy System CERES satellite instruments.&lt;/div&gt;&lt;div&gt;The study covers sixteen sites in East Africa–Ethiopia with neighboring Eritrea, Djibouti, and South Sudan countries clustered into four regions for the periods 2001–2022 to provide detailed information on the aerosol particles spatiotemporal correlations on clouds and precipitation. The increase–decrease AET, AWV, CFM and PPT fluctuations are with AOD opposing OLR, CTP and CTT. The spatial correlations are oriented towards western part mostly in southwest of the study area regions. The clustered regions show minima radiative forcing in 2012 at the southwest cluster for all surface radiative forcing F&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mtext&gt;Surf&lt;/mtext&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; and at the southeast cluster for top of the atmosphere radiative forcing F&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mtext&gt;TOA&lt;/mtext&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, with their maxima at the northwest cluster in 2022 for F&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mtext&gt;Surf&lt;/mtext&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; and in 2010 for F&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mtext&gt;TOA&lt;/mtext&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; from both instruments. Accordingly, the minimum values are −23.83 Wm&lt;sup&gt;−2&lt;/sup&gt; and 8.37 Wm&lt;sup&gt;−2&lt;/sup&gt; for Terra and −22.95 Wm&lt;sup&gt;−2&lt;/sup&gt; and 7.68 Wm&lt;sup&gt;−2&lt;/sup&gt; for Aqua, and the maxima are −0.58 Wm&lt;sup&gt;−2&lt;/sup&gt; and 63.80 Wm&lt;sup&gt;−2&lt;/sup&gt; for Terra −1.37 Wm&lt;sup&gt;−2&lt;/sup&gt; and 58.83 Wm&lt;sup&gt;−2&lt;/sup&gt; for Aqua, respectively. Here, the values for all of the parameters we observed in the Terra satellite are mostly greater than those of the Aqua satellite. The values for the parameters were higher in the southern clusters, specifically in the southwest clusters, than in the northern clusters.&lt;/div&gt;&lt;div&gt;The mean cloud fraction CFM was less dominant, while AET was the most dominant variable with 0.02733&lt;span&gt;&lt;math&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt; slop value &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;β&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mn&gt;15&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;17547&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; in the regression analysis. The study area regions showed the best performance R values, with 0.93941 &lt;span&gt;&lt;math&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt; R ","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109261"},"PeriodicalIF":2.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696419","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":"First comprehensive high resolution study of the 28SiH4 octad bending bands","authors":"O.N. Ulenikov ,&nbsp;O.V. Gromova ,&nbsp;E.S. Bekhtereva ,&nbsp;N.I. Nikolaeva ,&nbsp;C. Sydow ,&nbsp;S. Bauerecker","doi":"10.1016/j.jqsrt.2024.109259","DOIUrl":"10.1016/j.jqsrt.2024.109259","url":null,"abstract":"<div><div>The infrared spectrum of mono-silane was measured at varied experimental conditions with a Bruker Fourier transform infrared spectrometer IFS125HR and analyzed for the first time in the 2600–2950 cm⁻¹ region of the octad where 16 strongly interacting triply excited bending bands are located. The 3505 transitions belonging to fourteen sub-bands of the octad (with the exception of unappeared <span><math><mrow><mn>3</mn><msub><mrow><mi>ν</mi></mrow><mrow><mn>4</mn></mrow></msub><mrow><mo>(</mo><msub><mrow><mi>A</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>)</mo></mrow></mrow></math></span> and <span><math><mrow><mn>3</mn><msub><mrow><mi>ν</mi></mrow><mrow><mn>2</mn></mrow></msub><mrow><mo>(</mo><msub><mrow><mi>A</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>)</mo></mrow></mrow></math></span>) were assigned (<span><math><mrow><msup><mrow><mi>J</mi></mrow><mrow><mtext>max</mtext></mrow></msup><mo>=</mo><mn>20</mn></mrow></math></span>) and theoretically analyzed in the frame of the effective Hamiltonian model. The obtained set of 139 fitted parameters reproduces the initial 3505 experimental line positions with the <span><math><mrow><msub><mrow><mi>d</mi></mrow><mrow><mtext>rms</mtext></mrow></msub><mo>=</mo><mn>7</mn><mo>.</mo><mn>3</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>4</mn></mrow></msup></mrow></math></span> cm⁻⁴. A list of assigned experimental transitions is presented as the Supplementary data 2 to this paper.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109259"},"PeriodicalIF":2.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696418","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":"Update Granada–Amsterdam Light Scattering Database","authors":"O. Muñoz ,&nbsp;E. Frattin ,&nbsp;J. Martikainen ,&nbsp;D. Guirado ,&nbsp;M. Passas-Varo ,&nbsp;J. Escobar-Cerezo ,&nbsp;F.J. García-Izquierdo ,&nbsp;J.C. Gómez-Martín ,&nbsp;Z. Gray ,&nbsp;T. Jardiel ,&nbsp;F. Moreno ,&nbsp;A.J. Ocaña ,&nbsp;M. Peiteado ,&nbsp;A.T. Gallego-Calvente ,&nbsp;H. Volten","doi":"10.1016/j.jqsrt.2024.109252","DOIUrl":"10.1016/j.jqsrt.2024.109252","url":null,"abstract":"<div><div>We present an update to the Granada–Amsterdam Light Scattering Database (<span><span>https://scattering.iaa.es/</span><svg><path></path></svg></span>), which includes experimental data from both the IAA-Cosmic Dust Laboratory in Granada and the Amsterdam light scattering setup. The updated version features an expanded collection of samples and a more user-friendly interface. We have extended the size range of our mineral samples to mm-cm-sized single particles. Additionally, we have added the diffuse reflectance spectra of some of our powder samples and, from these spectra, obtained the corresponding refractive indices (200 nm–2000 nm). We have also incorporated synthetic scattering matrices defined across the entire scattering angle range (0° to 180°) for most of the powder samples contained in the database. Data in the database are freely available under the request of citation of this paper and the paper in which the data are published.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109252"},"PeriodicalIF":2.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Approximate P3 equation analysis in multi-layer slab media: Steady-state and time-domain based on the diffusion model","authors":"Xichang Wang","doi":"10.1016/j.jqsrt.2024.109245","DOIUrl":"10.1016/j.jqsrt.2024.109245","url":null,"abstract":"<div><div>This study aimed to establish a steady-state and time-domain solutions for the approximate P3 equation in arbitrary multi-layer slab media for light propagation, based on a diffusion model with an isotropic point source in the first layer and extrapolated boundary conditions. Spatially resolved diffuse reflectance and transmittance were calculated using the steady-state approximation of the P3 equation, whereas temporally resolved diffuse reflectance and transmittance were derived from the time-domain approximation. The validity of the approximate P3 solutions was confirmed by comparing their results with Monte Carlo simulations. In steady-state analysis, the approximate P3 equation demonstrated superior accuracy to the diffusion equation for reflectance, particularly at smaller thicknesses. Accuracy further improved as the absorption coefficient and detection distance increased. For transmittance, the approximate P3 equation closely matched the diffusion equation at low thickness, but divergence occurred with higher absorption. In time-domain analysis, the approximate P3 equation aligned closely with Monte Carlo simulations at peak values, while its numerical values were close approximations of the diffusion equation away from the peak. The potential application of the approximate P3 equation in multi-layer media offers significant advancements for optical non-invasive detection and treatment techniques, enabling the extraction of optical parameters from such media.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109245"},"PeriodicalIF":2.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696421","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}