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Measurement of unburned methane emissions in laboratory flames using mid-infrared hyperspectral imaging J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-09-20 Jesús Belmar, David Santalices, Shania Sánchez, Susana Briz, Juan Meléndez
In this study, we present a novel method for measuring unburned methane (CH4) emissions in laboratory flames using mid-infrared hyperspectral imaging. Given the environmental significance of methane’s global warming potential, accurately quantifying emissions from combustion processes is critical. Our approach integrates an extended-area blackbody as the infrared source and a bandpass interference
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Laser beam carrying orbital angular momentum scattering from a particle: Near-field intensity and phase numerical study J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-09-14 Svetlana Avramov-Zamurovic, Vasanthi Sivaprakasam, Matthew B. Hart, John E. McCarthy
The interaction of the light carrying orbital angular momentum (OAM) with a single spherical particle is explored using a commercial multi-physics simulation platform. The scattering of light with wavelength of 0.532 µm from an ice particle is presented. The research focuses on studying the light-matter interface within an observation volume of radius 10 times the wavelength (5.32 µm) and present near-field
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The reverse-DADI method: Computation of frequency-dependent atomic polarizabilities for carbon and hydrogen atoms in hydrocarbon structures J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-09-13 N. Brosseau-Habert, F. Miradji, S. Picaud, M. Devel
A specific method, combining some ingredients of the well-known DDA and PDI approaches, has been developed in our group since many years to calculate the absorption cross-sections of carbonaceous nanoparticles based on their atomistic details. This method, here named the Dynamic Atomic Dipole Interaction (DADI) model, requires the knowledge of the position and frequency-dependent polarizability of
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Stochastic algorithm for creating highly accurate optimized scattering look-up tables for a large range of size parameters and optical constants J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-09-13 Robert Furstenberg, Andrew Shabaev, Tyler J. Huffman, Christopher A. Kendziora, R. Andrew McGill
We report a novel algorithm for generating optimized look-up tables suitable for rapid evaluation of various light scattering parameters and other hard-to-evaluate functions. Our method uses a stochastic algorithm to minimize the number of look-up table points needed while achieving high accuracy and speed. As an example, we present a general Mie scattering look-up table applicable to a large range
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Resonant-mode metasurface thermal super mirror by deep learning-assisted optimization algorithms J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-09-12 Ken Araki, Richard Z. Zhang
A “super-mirror” having ultrahigh infrared reflectance is achieved by an optimized photonic contrast grating metasurface. Finding ways to achieve this exceptional performance can be enabled by implementing global optimization and machine learning elements, such as Bayesian optimization and genetic algorithm. Here, we acquired an optimized grating design made of high-index germanium, which excites resonances
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Mueller matrix symmetry for both reciprocal and nonreciprocal metamaterials J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-09-10 Chiyu Yang, Wenshan Cai, Zhuomin M. Zhang
Mueller matrices relate the Stokes parameters of the incident and emerging light, providing useful information about the radiative properties and other characteristics of the medium. Determining all elements of the 4 × 4 Mueller matrix requires complete polarimetry, which is often challenging to perform. Partial polarimetry, on the other hand, uses simpler optical components in generating and/or analyzing
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Collision induced absorption spectra of N2 and CH4 J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-09-10 R. Johnson, P. Bernath, B. Billinghurst, J. Zhao
Collision-induced absorption (CIA) spectra of nitrogen and methane are needed to model radiative transfer in atmospheres of objects such as Saturn's moon, Titan. We present rare, extremely low temperature Fourier transform infrared spectra of nitrogen and methane rototranslation CIA in the range of 40–600 cm−1. The peak CIA of methane was found to be 2.05×10−5 cm−1/amagat2 at 123.8 K while nitrogen
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Influence of columnar versus vertical distribution of aerosol properties on the modulation of shortwave radiative effects J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-09-09 V.N. Santhosh, B.L. Madhavan, M. Venkat Ratnam, Dinesh N. Naik
Quantifying the interaction of atmospheric aerosols with incoming solar radiation remains a challenge owing to the limitations associated with measuring aerosol optical properties. This study investigates how the distribution of aerosol properties, whether columnar or vertical, affects the aerosol radiative forcing (ARF) and heating rates (HRs) across different atmospheric layers under cloud-free conditions
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Suppressed narrowband reflectance of nanopatterned silicon photovoltaic cells J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-09-07 Eslem Enis Atak, Elif Begüm Elçioğlu, Tuba Okutucu Özyurt
The increasing demand for efficient yet nonpolluting energy conversion technologies require the photovoltaic (PV) systems to have fine-tuned optical responses and suppressed thermalization. PV cells that are based on Silicon are commonly patterned via lithography and etching techniques to implement micro/nanoscale surface components to reduce their reflectance on a wide spectrum while enhancing their
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Detecting changes in anthropogenic light emissions: Limits due to atmospheric variability J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-09-07 Salvador Bará
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New quantum assignments and analysis of high-resolution H212CO spectra in the range 3700–4450 cm-1 J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-09-06 A.V. Nikitin, A.A. Rodina, A.E. Protasevich, L. Manceron, M. Rey, V.G. Tyuterev
Four spectra of formaldehyde in natural isotopic abundance in the 3700–5200 cm region were recorded at low temperature 160–166 K at Synchrotron SOLEIL for various pressures. Line positions and intensities were retrieved by non-linear least-squares curve-fitting procedures in the range 3700–4450 cm and analyzed using ab initio based effective Hamiltonian and line intensities computed using new ab initio
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The Quantization Monte Carlo method for solving radiative transport equations J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-09-06 Laetitia Laguzet, Gabriel Turinici
We introduce the Quantization Monte Carlo method to solve thermal radiative transport equations with possibly several collision regimes, ranging from few collisions to massive number of collisions per time unit. For each particle in a given simulation cell, the proposed method advances the time by replacing many collisions with sampling directly from the escape distribution of the particle. In order
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Detailed radiation modeling of two flames relevant to fire simulation using Photon Monte Carlo — Line by Line radiation model J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-09-05 Chandan Paul, Somesh Roy, Johannes Sailer, Fabian Brännström, Mohamed Mohsen Ahmed, Arnaud Trouvé, Hadi Bordbar, Simo Hostikka, Randall McDermott
This work reports benchmark data sets for radiative heat transfer in two distinct fire configurations obtained from the Measurement and Computation of Fire Phenomena (MaCFP) working group database. The cases include a 19.2 kW non-sooting turbulent methanol pool fire and a 15 kW sooting ethylene flame (referred to as the FM burner). The base configurations were simulated with large eddy simulation (LES)
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Extended calculations of nitrogen-induced line broadening coefficients in the [formula omitted] band of ethylene J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-31 Sarah Clavier, Jeanna Buldyreva
Computations of room-temperature N-broadening coefficients are performed for 3546 lines in the infrared absorption band of ethylene to provide data required for atmospheric studies but missing in spectroscopic databases. The calculations are done in the framework of a semi-classical exact-trajectory approach developed previously (Buldyreva and Nguyen, 2008). The active molecule is rigorously treated
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The ethylene absorption spectrum between 6075 and 8050 cm-1: Empirical line list and rovibrational assignments J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-30 O. Ben Fathallah, S. Béguier, M. Rey, L. Manceron, A. Campargue
The highly congested absorption spectrum of ethylene (C2H4) is analyzed between 6075 and 8050 cm-1. In the 6200–8050 cm-1 range, a list of about 32,650 lines is retrieved from a room temperature spectrum recorded by Fourier transform spectroscopy (P = 15.72 mbar, L = 45 m). This dataset was merged with a set of about 3460 lines available in the literature in the region of the strong ν5+ν9 band near
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An inter-satellite laser occultation method profiling atmospheric temperature and pressure from troposphere to lower mesosphere J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-28 Xue Shen, Wei Kong, Tao Chen, Ye Liu, Genghua Huang, Rong Shu
We propose a laser occultation method for simultaneous profiling atmospheric temperature and pressure. Measurements can be performed on the optical link between two low-orbit satellites, where frequency-stepwise laser pulses are transmitted from one to the other. These pulses, covering several oxygen absorption lines in the wavelength domain, measure the broadened atmospheric absorption optical depth
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Ground-reflected light: The invariance principle and the effect of luminaire height, emission pattern, and non-uniform albedo J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-28 Miroslav Kocifaj, Tomáš Novák
The weighted contribution of ground-reflected component of light emissions from artificial sources gradually increases as the transitioning from bad-shielded to modernized light sources with low or zero direct uplight takes place in cities or towns. In this work, we demonstrate that the modeling of reflected light on a large domain for Lambertian flat surfaces does not require information about the
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Diffraction order penalization to improve spectrometer calibrations J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-28 Hunter Staiger, Alexander Kramida, Endre Takacs, Yuri Ralchenko
Wavelength calibration in diffraction spectroscopy typically depends on identifying strong, well-known lines in the recorded spectra and fitting a calibration function to them. In this paper, we outline a novel method (order penalization) for improving spectroscopic calibrations by extending non-linear least squares fitting of the calibration curve. The method introduces an extra term into the minimized
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Cavity ring-down spectroscopy of acetylene near [formula omitted] J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-27 O.M. Lyulin, G.-L. Liu, A.-W. Liu, Y. Tan, V. Perevalov, S.-M. Hu
A continuous-wave cavity ring-down spectrometer was employed to record the spectrum of the acetylene molecule spanning the 12350 - 12790 cm region. A total of 747 lines from the principal isotopologue and 68 lines from CCH were identified, with nearly all line intensities retrieved from the spectra. These lines belong to eighteen vibrational bands of CH and two vibrational bands of CCH, among which
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The influence of the location of arable land incorporating its roughness on the optimal time when the land reaches its mean diurnal blue-sky albedo value J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-27 Jerzy Cierniewski, Jarosław Jasiewicz
This work is a supplement the article “Influence of arable land location incorporating its roughness on blue-sky albedo variation” [J Quant Spectrosc Radiat Transf. 296 (2023) 108,440]. It quantifies the influence of the location (expressed by latitude) of bare arable land on a global scale and its roughness on the optimal time () of land observation with acceptable errors to determine its mean diurnal
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Continuum absorption in pure N[formula omitted] gas and in its mixture with Ar J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-26 E.A. Serov, T.A. Galanina, A.O. Koroleva, D.S. Makarov, I.S. Amerkhanov, M.A. Koshelev, M.Yu. Tretyakov, D.N. Chistikov, A.A. Finenko, A.A. Vigasin
The NNand NArcontinuum absorption spectra are calculated using the classical trajectory-based simulation (CTS). The spectra obtained are validated by new measurements in the subTHz spectral range along with the previously reported data in the far infrared. A novelty of our approach consists in the use of the CTS method to simulate both the fundamental nitrogen absorption band and the rototranslational
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Atomic structure and Stark width calculation for Cl III ion J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-26 Najah Alwadie, Walid F. Mahmoudi, Nabil Ben Nessib, Milan S. Dimitrijević
In this work, we calculated Stark broadening widths of several doubly-ionized chlorine Cl III spectral lines using the modified semi-empirical approach. The theoretical values of Stark widths are calculated using term energies and oscillator strengths of Cl III from the AUTOSTRUCTURE atomic structure code. We compared the calculated Stark widths with available data from the literature. If we need to
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Assessment of clear-sky irradiance from 6S affected by local climatology of India J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-25 Syed Haider Abbas Rizvi, Bhramar Choudhary, Ravi Choudhary, Jitendra Kumar Meher, Nimisha Gupta, Jasvipul Chawla, Mayank Kumar, Vikram Singh
Accurate estimation of solar power generation is crucial for the effective planning and operation of solar energy sector. Solar potential can be estimated at a location from long-term historical irradiance data processed from atmospheric reanalysis datasets. The current study employs a clear-sky radiative transfer model ( to simulate the net surface irradiance at four distinct locations in India, comparing
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Ab initio study of the interaction between the charged system (FH+) and the He atom J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-23 Haifa Nakbi, Mohammed Bejaoui, Chedli Ghanmi, Nissrin Alharzali, Hamid Berriche
We investigated the molecular structure and spectroscopic properties of the charged system (FH) in interaction with a helium atom using an quantum chemistry approach in Jacobi coordinates. Our study focused on the ground state XΠ of (FH) with various theoretical methods including UCCSD, UCCSD(T) and UCCSD(T)-F12, alongside basis sets like aug-cc-pVnZ (n = T, Q, 5, and 6) and cc-pVQZ-F12. We evaluated
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Tracing the physical signatures among the calculated global clear-sky spectral shortwave radiative flux distribution J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-22 Xiang Zhong, Xiquan Dong, Baike Xi, Jordann Brendecke, Peter Pilewskie
This study utilized the high-spectral resolution radiative transfer model (MODerate resolution atmospheric TRANsmission, MODTRAN6.0.2.5) to compute global clear-sky shortwave (SW) radiative flux and compared it with NASA’s Clouds and the Earth’s Radiant Energy System (CERES) Synoptic Radiative Fluxes and Clouds (SYN1deg) product. The comparison revealed that the global distributions of clear-sky downwelling
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DSGF solver for near-field radiative heat transfer: User guide J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-22 Lívia M. Corrêa, Lindsay P. Walter, Jan L. Čas, Mathieu Francoeur
The discrete system Green’s function (DSGF) method is a fluctuational electrodynamics-based numerical framework for predicting near-field radiative heat transfer (NFRHT) between three-dimensional thermal sources of arbitrary number, shape, size, and material. In the DSGF method, thermal sources are discretized into cubic subvolumes along a cubic lattice, and the system Green’s functions between all
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Evaluation of clear-sky surface downwelling shortwave fluxes computed by three atmospheric radiative transfer models J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-22 Jordann Brendecke, Xiquan Dong, Baike Xi, Xiang Zhong, Jiangnan Li, Howard W. Barker, Peter Pilewskie
In this study the clear-sky total, direct, and diffuse shortwave (SW) fluxes at the surface, have been calculated by three radiation transfer models (RTMs) – MODTRAN6.0 (M6.0), Canadian Centre for Climate Modelling and Analysis (CCCma), and Langley-modified Fu-Liou (NASA CERES). These calculations have been evaluated by surface measurements collected from seven sites that represent different climatological
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Collisional broadening and pressure shift coefficients for the potassium D1 and D2 transitions in oxygen and carbon dioxide at high temperatures J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-17 Joshua A. Vandervort, Konstantinos Kotsarinis, Spencer C. Barnes, Christopher L. Strand, Ronald K. Hanson
Collisional broadening and pressure shift parameters for the potassium resonance doublet, near 770 nm, are reported for collisions with molecular oxygen and carbon dioxide. Experiments were conducted in a reflected shock tube from 1200–2200 K and used potassium chloride (KCl) salt as the atomic potassium source. The measured absorption lineshapes were fit with Voigt profiles to infer the collisional
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Spectroscopy of resonantly saturated selective reflection from high-density rubidium vapor using the pump-probe technique J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-16 Vladimir Sautenkov, Sergey Saakyan, Andrei Bobrov, Leonid Khalutornykh, Boris B. Zelener
We study the resonant saturation of selective reflection at the interface between a transparent dielectric and high-density rubidium vapor on the D-line. Our estimates suggest that, within the selected atomic density range, the dipole–dipole self-broadening of the line can vary from 13.2 to 39.6 GHz. Two tunable lasers are used as sources of pump and probe beams with orthogonal linear polarizations
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Extraction evolutionary features of continuous light-induced plasmonic nanobubbles by a dynamic spectral regression model J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-14 Yifan Zhang, Wei An, Yao Qin
A comprehensive understanding of the nature of light-induced plasmonic nanobubbles (PNBs) generated around noble metal nanoparticles is essential for optimizing PNB-based applications, such as light-driven microfluidic control. To investigate the overall evolution pattern of plasmonic nanobubbles (PNBs) under continuous light illumination, a computational model based on the least-squares method is
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High-accuracy optical clocks with sensitivity to the fine-structure constant variation based on Sm[formula omitted] J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-13 Saleh O. Allehabi, V.A. Dzuba, V.V. Flambaum
We identify two metastable excited states in Sm highly charged ion as candidates for high accuracy optical clocks. Several atomic properties relevant to optical clock development are calculated using relativistic many-body methods. This includes energy levels, transition amplitudes, lifetimes, scalar polarizabilities, black body radiation shift, and the sensitivity to the fine structure constant variation
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Temperature dependence of line shape parameters for N2- and O2-broadened methane lines by quantum cascade laser spectroscopy J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-13 B. Vispoel, T. Roland, O. Browet, M. Lepère
This paper report nitrogen- and oxygen-broadening coefficients, their speed-dependencies, and the collisional narrowing parameters of lines in the ν-band of methane. The parameters were determined from low (150 K) to high temperatures (600 K). The measurements were done with a high-resolution quantum cascade laser spectrometer coupled to specific absorption cells that allow to cool and heat the gas
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Mid-infrared high-resolution dual-comb spectroscopy: Intensity, broadening, and beyond-Voigt parameters of [formula omitted] and [formula omitted] lines J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-13 Nicolas Dricot, Bastien Vispoel, Muriel Lepère
Using a high-resolution mid-infrared dual-comb spectrometer operating in the 1300 cm spectral region, spectra of acetylene were recorded at room temperature. Spectroscopic parameters were measured in 3 vibrational bands of both and . Absolute line intensities () and self-broadening coefficients () were determined in the , and bands. For the main isotopologue, the collisional narrowing coefficients
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The ammonia absorption spectrum between 3900 and 6350 cm-1: 15NH3 contribution and a recommended list for natural ammonia J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-10 P. Cacciani, P. Čermák, J. Vander Auwera, A. Campargue
Following previous contributions dedicated to the main isotopologue, 14NH3, in the present work, we examine the 15NH3 absorption spectrum between 3950 and 6350 cm-1 in order to elaborate an absorption line list for ammonia in natural isotopic abundance. For this purpose, several room temperature Fourier Transform absorption spectra of ammonia highly enriched in 15NH3 measured in the 90′s and available
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2D Raman imaging for vibrational and rotational temperature mapping in H2 J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-05 D. Del Cont-Bernard, M.D. Ruijzendaal, T.W.H. Righart, G.J. van Rooij, T.D. Butterworth
We showcase a Raman scattering diagnostic for 2D imaging of the rotational and vibrational temperatures of H. Applications include environments with vibrational-rotational non-equilibrium such as H-containing supersonic jets and plasma reactors. We image segments of the laser scattering spectrum, containing one or more Raman features, using an ICCD camera that is equipped with one of several bandpass
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Research on the modeling technique of infrared radiation scaling law for rocket engine exhaust plumes J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-08-05 Yiqiang Sun, Qinglin Niu, Tanxiao Zhu, Guanglu Zhang, Zhihong He, Shikui Dong
The complexity of the rocket motor exhaust plume radiation phenomenon, along with the influence of numerous parameters and implicit propagation, makes the theoretical simulation calculations expensive. This hinders design optimization, parameter identification, and other studies. Hence, it is crucial to establish the direct correlation between thrust, velocity, altitude, detection angle, and plume
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Analysis of the extreme ultraviolet broadband spectral characteristics and spatiotemporal evolution of laser-produced germanium plasmas J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-26 Yanhong Wu, Qi Min, Siqi He, Haidong Lu, Xingbang Liu, Kede Yang, Shiquan Cao, Duixiong Sun, Maogen Su, Chenzhong Dong
This paper presents comprehensive spectral measurements and a theoretical analysis of laser-produced germanium (Ge) plasma within the 7.5–17 nm wavelength range, with the measurements being performed using spatiotemporally-resolved emission spectroscopy. We obtained and analyzed the extreme ultraviolet (EUV) spectra and their variations meticulously at various positions adjacent to the target surface
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Spectro-polarimetric backscattering of atmospheric particles J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-25 Killian Aleau, Romain Ceolato, Matthew Berg, Guillaume Huss, Olga Muñoz, Gorden Videen
This study presents a new experiment to measure the polarization-resolved two-dimensional light-scattering patterns, near and including the backscattering direction, of fixed particles representative of some atmospheric-aerosol types. The measurements are conducted across a broad spectrum, from 450 to 850 nm, and for different polarization states. A supercontinuum laser, achromatic optics, and polarizers
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CaSDa24: Latest updates to the Dijon calculated spectroscopic databases J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-23 C. Richard, O. Ben Fathallah, P. Hardy, R. Kamel, M. Merkulova, M. Rotger, O.N. Ulenikov, V. Boudon
We introduce , the latest iteration of our high-resolution molecular spectroscopy database cluster. Comprising ten independent databases, each dedicated to a specific molecule (CH, CHCl, SF, CH, CF, GeH, RuO, SiF, UF, SiH), integrates updated and new databases since our previous publication. These databases include detailed lists of calculated spectral lines, eigenvectors, energy levels, and additional
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On the compromise between accuracy and computational cost of non-gray global models for heat radiation in gas mixtures J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-22 Soroush Rashidzadeh, Guilherme C. Fraga, Hadi Bordbar, Simo Hostikka
In this study the prediction accuracy of latest versions of FSK and SLW models (Rank correlated) and WSGG model is assessed at the limit of smallest computation cost. The results of these predictions are compared with the Line-by-Line benchmark calculations. One-dimensional decoupled radiation calculation is performed on a variety of case studies in order to investigate the limit of computational cost
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Real-time monitoring of CH4 and N2O emissions from livestock using mid-infrared external cavity quantum cascade laser absorption spectroscopy J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-22 Fengjiao Shen, Dong Chen, Gaoxuan Wang, Jun Lu, Xueyou Hu, Xiaoming Gao, Eric Fertein, Weidong Chen
The largest share of greenhouse gas (GHG) emissions related to livestock originates from methane (CH) and nitrous oxide (NO) which have a far higher influence on global warming, it is therefore necessary to accurately monitor CH and NO emissions to provide theoretical and practical basis for further estimating and regulating GHG emissions from livestock and improving livestock production performance
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Experimental temperature- and pressure-dependent absorbance cross sections and a pseudo-line-list model for methyl formate near [formula omitted] J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-20 Wey-Wey Su, Yiming Ding, Christopher L. Strand, Ronald K. Hanson
We first present quantitative, broadband absorbance cross sections of the C=O stretch fundamental rovibrational band of methyl formate in the 1670–1850 cm range at temperatures of 300, 600, 800, and 1000 K and pressures of 1–2 atm. The title molecular spectra were additionally studied across the pressure range of 1 to 35 atm at room temperature. Elevated temperature measurements were taken in argon
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Favorable and unfavorable many-body interactions for near-field radiative heat transfer in nanoparticle networks J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-20 Minggang Luo, Junming Zhao, Linhua Liu, Mauro Antezza
Near-field radiative heat transfer (NFRHT) in point-dipole nanoparticle networks is complicated due to the multiple scattering of thermally excited electromagnetic wave (namely, many-body interaction, MBI). The MBI regime is analyzed using the many-body radiative heat transfer theory at the particle scale for networks of a few nanoparticles. Effect of MBI on radiative heat diffusion in networks of
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Monte Carlo simulation of atmospheric radiative forcings using a path-integral formulation approach for spectro-radiative sensitivities J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-17 Nada Mourtaday, Mégane Bati, Stéphane Blanco, Jean-Louis Dufresne, Mouna El Hafi, Vincent Eymet, Vincent Forest, Richard Fournier, Jacques Gautrais, Paule Lapeyre, Yaniss Nyffenegger-Péré, Najda Villefranque
We present recent advances in path-integral formulations designed for unbiased Monte Carlo sensitivity estimation (in the form of partial derivatives) within a coupled physics model. We establish the theoretical foundation and illustrate the approach by estimating instantaneous atmospheric radiative forcings. In climate studies, these quantities amount for the change in top-of-atmosphere (TOA) net
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Infinite series solution of the time-dependent radiative transfer equation in anisotropically scattering media J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-16 Vladimir Allakhverdian, Dmitry V. Naumov
We solve the radiative transfer equation (RTE) in anisotropically scattering media as an infinite series. Each series term represents a distinct number of scattering events, with analytical solutions derived for zero and single scattering. Higher-order corrections are addressed through numerical calculations or approximations.
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Valence and Rydberg excitations of 4-fluorotoluene in the 4.3–10.8 eV photoabsorption energy region J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-14 L.V.S. Dalagnol, S. Kumar, A.I. Lozano, M.H.F. Bettega, N.C. Jones, S.V. Hoffmann, A. Souza Barbosa, P. Limão-Vieira
This work reports on the first measurements of the lowest-lying singlet states as studied by photon spectroscopy for -fluorotoluene, 4-CHF. Here we present the high-resolution vacuum ultraviolet photoabsorption spectrum in the 4.3–10.8 eV energy-range, with assignments supported by calculations (vertical excitation energies and oscillator strengths) at two different levels of theory, equation-of-motion
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Extending the use of normal hemispherical transmittance ([formula omitted]) measurements by modeling 3D multiple scattering radiative transfer J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-14 Guillaume Foin, Laurent Brunel, Jean-François Cornet, Jérémi Dauchet, Fabrice Gros, Thomas Vourc’h
Spectrophotometers or optical benches using integrating spheres to measure normal-hemispherical transmittance are widespread laboratory equipments. Although it is known that they cannot be used for ”highly turbid” samples, because multiple scattering may lead transmitted radiation to miss the entrance of the integrating sphere, very little is generally known about their exact validity range. Here we
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Channel selection method for the CH4 profile retrieval using the Atmospheric Sounder Spectrometer by Infrared Spectral Technology J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-14 Yue Wang, Hanhan Ye, Hailiang Shi, Xianhua Wang, Chao Li, Erchang Sun, Yuan An, Shichao Wu, Wei Xiong
Methane (CH) is the second-largest greenhouse gas contributing to global warming, surpassed only by CO, has a large difference in its vertical concentration distribution, and closely affects the global environment and climate change. The variations in the vertical concentrations of CH need to be monitored. Ground-based infrared hyperspectrometers can measure the fine variations of the CH concentrations
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Water-vapor absorption database using Dual Comb Spectroscopy from 300 to 1300 K Part II: Air-Broadened H2O, 6600 to 7650 cm−1 J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-11 Scott C. Egbert, Keeyoon Sung, Sean C. Coburn, Brian J. Drouin, Gregory B. Rieker
We present broadband dual frequency comb laser absorption measurements of 2 % HO (natural isotopic abundance of 99.7 % HO) in air from 6600 to 7650 cm (1307–1515 nm) with a spectral point spacing of 0.0068 cm. Twenty-nine datasets were collected at temperatures between 300 and 1300 K (±0.82 % average uncertainty) and pressures ranging from 20 to 600 Torr (±0.25 %) with an average residual absorbance
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Thermal radiation at high-temperature and high-pressure conditions: Validation of HITEMP-2010 for carbon dioxide J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-10 Maximilian Dammann, Roman Weber, Alexander Fateev, Sønnik Clausen, Michael Alberti, Thomas Kolb, Marco Mancini
Line-by-line models based on spectroscopic databases are powerful tools for the generation of accurate gas absorption spectra but still require validation for high-temperature and high-pressure conditions. Therefore, this study carried out spectral transmissivity measurements of CO2/N2 mixtures at temperatures of approximately 773K and 1273K and pressures between 1bar and 60bar. The measurement data
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Radiative properties of spherical microalgae synergically considering optical constants of organelle and internal structure of cell J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-08 Li Lin, Miao Jiang, Zeguo Shang, Jinyuan Lv, Xingcan Li, Lanxin Ma, Jia-Yue Yang
The radiation characteristics of microalgae are of great significance for the design of photobioreactors and ocean optical remote sensing. The complex structure of microalgae makes it difficult to theoretically calculate its radiation characteristics. Herein, the spherical microalgae cells are modeled, considering the shape of cells similar to the spherical cell microstructure, and a heterogeneous
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The wide spectral range characteristics and dynamic evolution of laser-produced tin plasmas J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-06 Yaqing Gao, Maogen Su, Siqi He, Haidong Lu, Xingbang Liu, Yanhong Wu, Shiquan Cao, Qi Min, Duixiong Sun, Chenzhong Dong
The energy levels and transitions of highly charged Sn ions are key data for analyzing emission spectra, radiative opacity, and conversion efficiency of laser-produced Sn plasmas. Temporally–resolved spectra in the 6–45-nm range were acquired via high-precision, spatio–temporally resolved techniques. In addition, the Cowan code, based on Hartree–Fock multi-configurational interactions, was used to
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Three approaches on estimating geometric sensitivities in radiative transfer with Monte Carlo J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-05 Zili He, Paule Lapeyre, Stephane Blanco, Eugene d’Eon, Simon Eibner, Mouna El Hafi, Richard Fournier, Maxime Roger
The Monte Carlo method, renowned for its ability to handle the spectral and geometric complexities of 3D radiative transfer, is extensively utilized across various fields, including concentrated solar power design, atmospheric science, and computer graphics. The success of this method also extends to the estimation of sensitivity—the derivative of an observable with respect to a given system parameter
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Bidirectional Reflectance Distribution Function (BRDF) measurements, modeling and applications in space-agile Tx/Rx common aperture system J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-03 Junli Guo, Peixian Han, Meili Zhang, Bingxu Chen, Zhenchuang Li, Ge Ren, Bo Qi, Yuhua Cheng
The Tx/Rx common aperture system not only needs to suppress out-of-field stray light, but also needs to suppress the influence of optical surface backscatter on detectivity. Backscatter generated by optical surfaces is often the dominant source of stray radiation that causes T/R isolation problems, and the black surfaces chosen for baffles also play a significant role in stray light suppression. Four
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Impact of spectral coupling between urban atmosphere and sky boundary conditions in a street canyon J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-02 Félix Schmitt, Mathieu Galtier, Lucie Merlier, Etienne Vergnault, Frédéric André
Most radiative transfer models developed for the analysis of urban configurations consider a transparent urban atmosphere and gray sky conditions. The aim of the present work is to investigate these assumptions, focusing on the longwave domain. For this purpose, reference Line-by-Line Monte-Carlo calculations are first performed. A more efficient radiative transfer model based on the Finite Volume
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Spectral bidirectional reflectance measurement of packed pure gypsum grains J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-07-02 Changhao Ni, Yuxue Sun, Hao Zhang, Yujin Huang
Gypsum, a typical hydrous calcium sulfate, has been found in some carbonaceous chondrites with aqueous alterations and has also been identified on Mars using visible and near-infrared (VNIR) reflectance spectra measured by orbiting and in-situ sensors. Therefore, gypsum may exist on more extraterrestrial bodies that have undergone hydration processes. Due to the dependence of spectral features on illumination
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On the retrieval of cloud optical thickness from spectral radiances - A sensitivity study with high albedo surfaces J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-06-30 Filippo Calì Quaglia, Giovanni Muscari, Daniela Meloni, Annalisa Di Bernardino, Tatiana Di Iorio, Giandomenico Pace, Sebastian K. Schmidt, Alcide di Sarra
Measurements of spectral zenith radiance in the 320–950 nm wavelength range have been carried out since 2021 at the Thule High Arctic Atmospheric Observatory (THAAO, , 76.5° N, 68.8° W, 225 m a.s.l) located in Pituffik, northern Greenland. This study evaluates whether such observations could provide, in principle, scientifically meaningful cloud optical depth (τ) estimates, what would be the limitations
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Coherent and low-coherent enhanced backscattering in tissue models J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-06-29 V.L. Kuzmin, Yu.A. Zhavoronkov, S.V. Ul’yanov
We perform simulations of coherent backscattering enhancement, explicitly accounting for the finiteness of spatial coherence of radiation. Three plausible models are considered, which produce the broadening of the coherent backscattering angular profile with the loss of spatial coherence. These models show fair agreement with data obtained earlier for biological media. Additionally, the exact solution
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View factor of a spheroid and an ellipse from a plate element J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-06-29 Kaname Sasaki
A view factor is a fundamental parameter for evaluating radiative heat transfer between two surfaces. View factors for various geometries have been investigated in the past studies. However, the view factors of a spheroid and an ellipse are known only for limited configurations. In this study, the analytical view factor expressions of an ellipse and a spheroid from a plate element are derived. The
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The 2024 release of the ExoMol database: Molecular line lists for exoplanet and other hot atmospheres J. Quant. Spectrosc. Radiat. Transf. (IF 2.3) Pub Date : 2024-06-27 Jonathan Tennyson, Sergei N. Yurchenko, Jingxin Zhang, Charles A. Bowesman, Ryan P. Brady, Jeanna Buldyreva, Katy L. Chubb, Robert R. Gamache, Maire N. Gorman, Elizabeth R. Guest, Christian Hill, Kyriaki Kefala, A.E. Lynas-Gray, Thomas M. Mellor, Laura K. McKemmish, Georgi B. Mitev, Irina I. Mizus, Alec Owens, Zhijian Peng, Armando N. Perri, Marco Pezzella, Oleg L. Polyansky, Qianwei Qu, Mikhail Semenov