Article
Astronomy & Astrophysics
Reggie L. Hudson, Perry A. Gerakines, Yukiko Y. Yarnall
Summary: This article re-investigates the infrared spectra of NH3 ices to provide data for quantitative measurements of solid NH3. The study finds significant omissions and difficulties in previous work, requiring corrections and adjustments. The article presents new experimental results and suggests future research directions and applications.
ASTROPHYSICAL JOURNAL
(2022)
Article
Optics
Konstantin Kazakov, Andrey A. Vigasin
Summary: The theoretical approach developed for Herman-Wallis factors in a linear molecule effectively estimates line intensities in CO2 molecule without complex algebra. Additionally, an analog of Herman-Wallis factors is introduced for dipole-forbidden bands relevant to collision-induced absorption in CO2. The rovibrational perturbation explains the intensity crossflow among branches in a rotationally unresolved CIA envelope.
Article
Chemistry, Physical
Aleksandr A. Balashov, Katarzyna Bielska, Gang Li, Aleksandra A. Kyuberis, Szymon Wojtewicz, Jolanta Domyslawska, Roman Ciurylo, Nikolay F. Zobov, Daniel Lisak, Jonathan Tennyson, Oleg L. Polyansky
Summary: The intensities of 14 lines in the sixth overtone (7-0) band of 12CO are measured using a frequency-stabilized cavity ring-down spectrometer in the visible range. This is the first observation of such a high and weak overtone spectrum of the CO molecule. A theoretical model is constructed and tested based on accurate ab initio dipole moment and semi-empirical potential energy curves. Although the high overtone transitions present a challenge due to their weak lines, agreement between theory and experiment is achieved within a few percent of experimental uncertainty, after addressing issues with the stability of the Davidson correction to the multi-reference configuration interaction calculations.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Astronomy & Astrophysics
C. Richard, V. Boudon, L. Manceron, J. Vander Auwera, S. Vinatier, B. Bezard, M. Houelle
Summary: In this study, the broadening coefficients of pure rotational lines of methane were measured under different pressure and temperature conditions. The Voigt profiles were used to fit the spectra and determine the self and N2 broadening coefficients, as well as the temperature dependence exponents. These coefficients were then used to model spectra of Titan and compared to Cassini/CIRS spectra, showing a good agreement for a stratospheric methane mole fraction of (1.17±0.08)%.
Article
Astronomy & Astrophysics
A. Maragkoudakis, E. Peeters, A. Ricca
Summary: This study examines the variations in spectral characteristics and intensities of polycyclic aromatic hydrocarbons (PAHs) in two different scenarios of PAH processing: destruction of small PAHs or formation of large PAHs, and vice versa. PAH emission was measured with and without plateau components. The results show that smaller PAHs have a larger impact on the PAH band strengths, and smaller PAHs primarily contribute to plateau emission. The 7.7/(11.0 + 11.2) μm PAH band ratio is the best choice for tracing PAH charge, and the 3.3/(11.2 + 11.0) μm PAH band ratio is efficient for both tracing PAH size and characterizing the dominant processing or formation scenario.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ameek Sidhu, Josh Bazely, Els Peeters, Jan Cami
Summary: PCA analysis was conducted on the fluxes of five PAH bands in the reflection nebula NGC 7023. The results showed that two principal components explained most of the observed variance in PAH fluxes. The first component represented total PAH emission while the second component was related to the ionization state of the PAHs. The analysis also revealed the presence of two subsets of ionized bands in the PDR but not in the cavity.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Engineering, Aerospace
Gauri Devi, Amit Pathak, Akant Vats
Summary: This study presents a DFT investigation on PANH molecules and their ionized variants, focusing on their IR spectroscopic features in the 6-10 μm region. The presence of polycyclic aromatic hydrocarbons and polycyclic aromatic nitrogen heterocycles in the interstellar medium as cationic or anionic forms may contribute to the complex nature of aromatic infrared bands.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Chemistry, Physical
Swapnil Singh, Roman Szostak, Miroslaw Antoni Czarnecki
Summary: This study provides new quantitative information on the vibrational spectra of liquid CHCl3, CDCl3, CHBr3, and CDBr3, showing the influence of anharmonicity on the spectra. The presence of Fermi resonance is found to significantly affect the vibrational intensity of CDBr3. Experimental and theoretical contributions from the MIR and NIR ranges are consistent, highlighting discrepancies in predicting the intensities of overtones and combination bands.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Multidisciplinary
Jun-Rong Zheng, En-Ming You, Yuan-Fei Hu, Jun Yi, Zhong-Qun Tian
Summary: Hot carriers injected into semiconductor enable below-bandgap photodetection, and the performance of hot carrier-based devices is related to the absorptivity of metal. Strategies such as surface plasmons, metamaterials, and optical cavities are used to enhance metal absorption, but narrow resonance bandwidth limits detection range. In this study, a purely planar hot-hole photodetector based on ultrathin gold film, an impedance-matched absorber, is designed. The device achieves high photoresponsivity and wide detection range, setting a new record for hot carrier photodetectors.
Article
Food Science & Technology
Wanxiu Xu, Yongsheng Pei, Guanyu Zhu, Congying Han, Mei Wu, Tao Wang, Xiaohuang Cao, Yonghua Jiang, Gang Li, Jianfeng Sun, Jinghong Tian, Chao Tang, Zhao Gao
Summary: This study investigated the drying kinetics, color, and aroma of Anoectochilus using strategies of far infrared drying (FID) and far infrared combined with hot air drying (FIHAD). The results showed that FIHAD strategy reduced drying time and retained better color, aroma, and bioactive compounds compared to FID. The optimal quality was achieved with the FIHAD60 degrees C strategy.
LWT-FOOD SCIENCE AND TECHNOLOGY
(2022)
Article
Astronomy & Astrophysics
A. Maragkoudakis, E. Peeters, A. Ricca, C. Boersma
Summary: This study examines the dependence of polycyclic aromatic hydrocarbon (PAH) band intensity ratios on the average number of carbon atoms and assesses their effectiveness as tracers for PAH size using the NASA Ames PAH Infrared Spectroscopic Database. The research finds that band ratios including the 3.3 μm PAH band provide the best PAH size tracers for small-to-intermediate sized PAHs. Additionally, band ratios including the sum of the 15-20 μm PAH features and the 6.2 or 7.7 μm bands also serve as good tracers for PAH size in this range.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
Xin-Xian Wu, Cheng-Yu Lu, Tsung-Yu Huang
Summary: In this study, an oblique-flat-sheet metamaterial perfect absorber (MPA) was designed to enhance the sensitivity of a biosensor. By simulating and conducting experiments, it was confirmed that the MPA had higher sensitivity.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Brent R. Westbrook, Griffin M. Beasley, Ryan C. Fortenberry
Summary: Tetrahedrane is the smallest Platonic hydrocarbon and has been the subject of study for 50 years. Its infrared spectrum and synthetic pathway remain unknown. Recent research has linked the ultraviolet extinction bump observed in the interstellar medium to tetrahedral clusters formed from tetrahedrane. Tetrahedrane, which is similar in structure to molecules responsible for unidentified infrared bands, may play a role in both sets of observations. The accurate theoretical data reported in this study can aid in the identification of tetrahedrane if it is present in the interstellar medium and guide future synthetic experiments.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Marco Mendolicchio, Julien Bloino, Vincenzo Barone
Summary: This paper demonstrates the use of standard second-order vibrational perturbation theory (VPT2) in handling degeneracy issues in non-Abelian groups and deriving their spectroscopic signatures through post-transformation. The comparison with previous implementations shows perfect agreement for vibrational energies of linear and symmetric tops.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2021)
Article
Optics
O. Ben Fathallah, W. Hammi, A. Boughdiri, L. Manceron, H. Aroui
Summary: In this study, line intensities and pressure broadening coefficients of CH3I molecule in the nu(2) parallel band were measured using a high resolution Fourier transform spectrometer. Key parameters were derived through fitting techniques, and rotational dependencies of the observed self-broadening coefficients were analyzed and modeled.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Chemistry, Multidisciplinary
Elavenil Ganesan, Thomas Custer, Arun-Libertsen Lawzer, Jean-Claude Guillemin, Robert Kolos
Summary: We report the first detection of phosphorescence from the phosphaethynyl radical, which is studied in solid argon. This quartet-doublet emission is believed to be promoted by efficient intersystem crossing from the originally photoexcited doublet state to the adjacent second quartet state. Vibrational progressions were observed in the a(4)sigma(+)-X-2 sigma(+) and a(4)sigma(+)-A(2)n(i) systems.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Alessio Melli, Mattia Melosso, Luca Bizzocchi, Silvia Alessandrini, Ningjing Jiang, Francesca Tonolo, Salvatore Boi, Giorgia Castellan, Carlotta Sapienza, Jean-Claude Guillemin, Luca Dore, Cristina Puzzarini
Summary: The study presents a general approach for producing and investigating unsaturated carbon chains using selected test cases. Through theoretical/experimental spectroscopic characterization and quantum-chemical calculations, accurate predictions of missing spectroscopic information were obtained. Rotational spectra of the molecules were studied up to 400 GHz using specific instruments, significantly expanding spectral predictions over a wide frequency range.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Chemistry, Organic
Hajer Ayachi, Houda Gazzeh, Taoufik Boubaker, Jean-Claude Guillemin
Summary: The key compounds (Z)- and (E)-iminoacetonitriles (NCCH=NH), which are hydrogen cyanide dimers, play important roles in prebiotic chemistry. Methylenecyanamide (CH2=NCN), the second most thermodynamically stable dimer of HCN with covalent bonds, has been poorly studied. We demonstrate that this compound can be isolated, forms stable adducts with nucleophiles or dienes, and can be easily generated under prebiotic conditions, suggesting a potential role in this environment. Comparison between isomers reveals significant differences in formation and chemical reactivity.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Astronomy & Astrophysics
R. Fuentetaja, C. Bermudez, C. Cabezas, M. Agundez, B. Tercero, N. Marcelino, J. R. Pardo, L. Margules, R. A. Motiyenko, J. -C. Guillemin, P. de Vicente, J. Cernicharo
Summary: In this study, the detection of methyl ketene in TMC-1 is reported using the QUIJOTE line survey. Nineteen rotational transitions were identified, providing a derived column density for CH3CHCO and a rotational temperature. The abundance ratio between ketene and methyl ketene was determined to be 93.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Lucie Kolesnikova, Tereza Uhlikova, Jan Koucky, Katerina Lukova, Dominik Habiger, Patrik Kania, Jean-Claude Guillemin, Stepan Urban
Summary: Systematic astronomical investigations have shown great interest in vinyl-bearing compounds due to the recent detections of vinylamine, vinylacetylene, and vinylcyanoacetylene in interstellar space. In this study, we explore the possibility of finding vinylketene in the interstellar medium through rotational transitions. We obtained an improved set of spectroscopic parameters for the most stable trans conformer and reported the rotational signatures and molecular constants for the less stable cis form for the first time. The precise transition frequencies and intensities of vinylketene are provided, paving the way for further interstellar explorations of the C4H4O isomer family.
ASTROPHYSICAL JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Arun-Libertsen Lawzer, Elavenil Ganesan, Marcin Gronowski, Thomas Custer, Jean-Claude Guillemin, Robert Kolos
Summary: Until now, there has been limited experimental evidence for the presence of free arsinidenes and stibinidenes, except for AsH and SbH hydrides. This study demonstrates the photogeneration of triplet ethynylarsinidene (HCCAs) and triplet ethynylstibinidene (HCCSb) from ethynylarsine and ethynylstibine in solid argon matrices. The identification of the products was done using infrared spectroscopy, and the associated UV absorption spectra were analyzed with theoretical predictions.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Jean-Yves Salpin, Violette Haldys, Jean-Claude Guillemin, Otilia Mo, Manuel Yanez, M. Merced Montero-Campillo
Summary: The gas-phase reactivity of alkylmercury cations CnH2n+1Hg+ towards cytosine (C), particularly CH3Hg+, C2H5Hg+, n-C4H9Hg+ and t-C4H9Hg+, was investigated using tandem mass spectrometry, infrared multiple photon dissociation spectroscopy (IRMPD), and density functional theory (DFT) calculations. Electrospray conditions induced the formation of [RHg(C)](+) complexes (R=Me, Et, n-Bu) from the interaction between C and the cations derived from alkylmercury chloride compounds, except for t-butylmercury which showed no reactivity. Subsequent MS/MS experiments demonstrated that [RHg](+) ions exhibit a unique reactivity characterized by the transfer of the alkyl group, R, to the nucleobase, resulting in the formation of [(C)R](+), accompanied by metal reduction and loss of Hg-0. With increasing alkyl chain length (n ≥ 2), a new fragmentation path leading to protonated cytosine was observed, accompanied by the elimination of a C-n,H-2n,Hg moiety. This process was found to be particularly dominant for n-BuHg+. The mechanisms of both dissociation channels were studied using IRMPD data in the fingerprint region and exploring the corresponding potential energy surfaces in the DFT framework.
ISRAEL JOURNAL OF CHEMISTRY
(2023)
Article
Physics, Atomic, Molecular & Chemical
Evan G. Robertson, Mahmut Ruzi, Don McNaughton, Laurent Margules, Roman A. Motiyenko, Jean-Claude Guillemin
Summary: Rotational transitions of propynal (HCCCHO) were measured in the 150-900 GHz region using millimeter wave spectroscopy and in the far-infrared region using high-resolution FTIR spectroscopy with a synchrotron source. Perturbations in the ground vibrational state were observed due to Fermi-asymmetry resonance with an excited vibrational state. The rotational constants of different isotopologues were determined, and a Rm(2) structure for propynal was determined.
JOURNAL OF MOLECULAR SPECTROSCOPY
(2023)
Article
Physics, Atomic, Molecular & Chemical
Holger S. P. Mueller, Jes K. Jorgensen, Jean-Claude Guillemin, Frank Lewen, Stephan Schlemmer
Summary: We prepared a doubly deuterated oxirane sample and studied its rotational spectrum in the laboratory. The spectroscopic parameters were determined accurately and used to tentatively identify c-CD2CH2O in the interstellar medium. The degree of deuteration in multiply deuterated isotopologs was found to be higher compared to singly deuterated variants.
JOURNAL OF MOLECULAR SPECTROSCOPY
(2023)
Article
Astronomy & Astrophysics
Luyao Zou, Jean-Claude Guillemin, Arnaud Belloche, Jes K. Jorgensen, Laurent Margules, Roman A. Motiyenko, Peter Groner
Summary: So far, only six imines have been observed in the interstellar medium. Among them, 2-propanimine ((CH3)(2)C = NH) is predicted to have the lowest energy and is considered a potential candidate for astronomical searches. In this study, the first high-resolution millimeter wave spectrum of 2-propanimine was obtained and analyzed. The results can guide the search for 2-propanimine in two molecule-rich sources using ALMA observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Otilia Mo, Ibon Alkorta, Jean-Claude Guillemin, Manuel Yanez
Summary: The effect of changing the substituent from the first row to the second row on the intrinsic acidity and basicity of R-C COH and R-C CSH compounds was investigated. The basicities of R-C CSH derivatives are higher than those of R-C COH analogs, while the acidity gap is small. The acidity gap increases systematically as the CC bond goes from triple to single, while the trend is opposite for basicity. However, the variation of the basicity with the nature of the substituents is different for R-C CX (X = OH, SH) compounds.
THEORETICAL CHEMISTRY ACCOUNTS
(2023)
Article
Chemistry, Organic
Alexandre Quelhas, Thierry Roisnel, Jean-Claude Guillemin, Yann Trolez
Summary: The kinetically unstable propargylisocyanide complexed with tetrakis(acetonitrile) copper(I) hexafluorophosphate and participated in a copper-catalyzed alkyne-azide cycloaddition reaction (CuAAC). After decomplexation, the isocyanide was involved in a Ugi reaction. This complexation allows reactions on the CC triple bond without the constraints of compound instability or competitive reactivity of the isocyanide group.
Article
Astronomy & Astrophysics
D. Alberton, V. Lattanzi, C. Endres, V. M. Rivilla, J. C. Guillemin, P. Caselli, I. Jimenez-Serra, J. Martin-Pintado
Summary: A laboratory investigation was conducted to obtain precise frequency data of Z-aminoacrylonitrile, an alkenyl cyanide, for interstellar detection. The data was then used to search for Z-aminoacrylonitrile in the G+0.693-0.027 molecular cloud located near the Galactic center.
ASTROPHYSICAL JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Otilia Mo, Al Mokhtar Lamsabhi, Jean-Claude Guillemin, Manuel Yanez
Summary: The structure, stability, and bonding characteristics of 1,1- and 1,2-ethenediol and their various charged species were studied. The results show that their stability, basicity, and acidity are influenced by their conformers and protonation states.
JOURNAL OF COMPUTATIONAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Carlos Cabezas, Ching-Hua Chang, Jean-Claude Guillemin, Yasuki Endo
Summary: Fourier transform microwave spectra of two chlorine substituted vinyl radicals were observed in the 4-52 GHz frequency range. The radicals were generated using electric discharges and molecular precursors. Precise molecular constants were determined for both radicals.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Optics
Jianbao Zhao, Brant E. Billinghurst, Paul L. Raston
Summary: The far-infrared spectrum of room temperature formic acid labeled with 13C has been recorded and analyzed, leading to the determination of accurate line positions and predictions relevant to Earth's atmosphere and interstellar sources.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Semen Vasilchenko, Alexander Solodov, Oleg Egorov, Vladimir Tyuterev
Summary: Ozone plays a crucial role in atmospheric chemistry and radiative processes, and it may serve as a potential biosignature species in exoplanetary observations. This study utilized a continuous-wave cavity-ring-down spectrometer to accurately measure the absorption cross-sections of ozone in the near-infrared range. The results provide more precise data and have potential applications in atmospheric research.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Baorui Huang, Bo Peng, Qifeng Ren, Sheng Liao
Summary: This study utilizes the polarization bidirectional reflectance distribution function (p-BRDF) model derived from the microfacet theory to analyze the spectral p-BRDF of a brass surface. The results show that factors such as polarization state, wavelength, surface roughness, and permittivity have a significant impact on the distribution of BRDF on the object surface.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Qingwei Duan, Jiajie Wang, Qiwei Li, Xiang'e Han, Kuan Fang Ren
Summary: This paper introduces the applications of the generalized Lorenz-Mie theory (GLMT) and the vectorial complex ray model (VCRM) in the interaction between beams and particles. By comparing the experimental results, it is found that VCRM performs well in Gaussian beam scattering problems, providing a new method for studying the scattering of shaped beams by large particles/objects of any shape.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Yuefan Du, Xiaoping Li, Lei Shi, Fangyan Li, Shurong Yuan
Summary: This study proposes a physics-constrained model that utilizes the distribution characteristics of gas spectral parameters to predict spectral parameters for unknown wavelengths. Experimental results show that the model improves prediction accuracy and increases the data volume of gas spectral parameters by 4-5 times.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Laurentius Windholz, Imran Siddiqui, Shamim Khan, Syed Tanweer Iqbal
Summary: In this study, we report the discovery of two energy levels of the Pr atom that exhibit strong J-mixing, as well as the observed hyperfine structure patterns. The composition of wave functions, in addition to J-values, plays a crucial role in determining the appearance of these patterns.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Matthias Germann, Adrian Hjalten, Jonathan Tennyson, Sergei N. Yurchenko, Iouli E. Gordon, Christian Pett, Isak Silander, Karol Krzempek, Arkadiusz Hudzikowski, Aleksander Gluszek, Grzegorz Sobon, Aleksandra Foltynowicz
Summary: In this study, optical frequency comb Fourier transform spectroscopy was used to record the spectroscopic data of formaldehyde in a specific frequency range. The line positions and intensities of rovibrational transitions were obtained through line-by-line fitting. By incorporating these accurate line positions into the analysis, more energy levels and rovibrational transitions were predicted with reduced uncertainties in the H2CO spectrum.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Leonardo A. Ambrosio, Jhonas O. de Sarro, Gerard Gouesbet
Summary: This study derives a polychromatic version of the generalized Lorenz-Mie theory stricto sensu (GLMT) by expanding arbitrary time-dependent fields into partial waves using Bromwich scalar potentials. The new formalism introduces field shape spectra (FSSs) which are intrinsically frequency-dependent, modifying and redefining the physical quantities expressed in the monochromatic GLMT.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Patrick C. Chaumet
Summary: The paper proposes two new methods (IDR(s) and GPBiCGstab(L)) for computing the electromagnetic diffraction of objects larger than the wavelength. It is found that IDR(s) can reduce computation time but may not converge in some cases, while GPBiCGstab(L) always converges and also reduces computation time compared to QMR, GPBiCG, and BiCGstab.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Antigoni Kleanthous, Anthony J. Baran, Timo Betcke, David P. Hewett, Christopher D. Westbrook
Summary: To improve weather and climate models, it is important to accurately calculate the single-scattering properties of randomly oriented complex atmospheric ice crystals. This study applies Boundary Element Method (BEM) to calculate these properties in the microwave and sub-millimeter region of the electromagnetic spectrum for all-sky data assimilation. The results show that BEM can accurately compute the scattering properties of complex ice aggregates, which is crucial for weather and climate models.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Ben Niu, Yanting Li, Gang Xiong, Jihui Chen, Zhimin Hu, Yunqing Fu, Yaming Zou, Chongyang Chen, Ke Yao
Summary: This study presents both experimental and theoretical analysis of the 4d 2D5/2 -> 2D3/2 magnetic dipole transition in Rb-like ions. The correlation between the theoretical and experimental findings is observed, and it is illustrated that the contribution of the core-valence correlation is pivotal for the fine structure splittings.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
James A. Lock, Gunther P. Konnen, Philip Laven
Summary: Researchers have derived an analytical generalization of Airy theory that provides a more accurate approximation for the primary rainbow, but still has limitations for the second-order rainbow and beyond.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Shixiong Wu, Xuebang Gao, Xuqiang Dou, Li Xie
Summary: In this paper, an indoor experimental study was conducted to investigate the optical attenuation caused by sand/dust storms at different relative humidity levels. It was found that the hygroscopic growth of sand/dust particles has a significant effect on optical attenuation when the relative humidity is above 60%. Based on the double-parameter Kasten model, a proposed optical attenuation model takes into account visibility, particle size, relative humidity, and optical wavelength. Numerical calculations considering the hygroscopicity effect were also performed, and the results were in agreement with the experimental data.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Zhimin Yang, Jaeman Song, Bong Jae Lee
Summary: In this study, we analyze TPX cells operating in the self-sustaining circuit and examine the effects of different bandgaps on their performance. The results show that the bandgap energy of the LED must exceed that of the PV cell for the TPX cell to function in a self-sustaining parallel circuit. Additionally, a narrower bandgap energy for the PV cell and a wider bandgap energy for the LED can improve the performance of the TPX cell in the self-sustaining circuit.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
