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Time-resolved fourier transform infrared emission spectroscopy of NH radical in the Xsup3/supΣsup−/sup ground state
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SYSNO ASEP 0560210 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Time-resolved fourier transform infrared emission spectroscopy of NH radical in the Xsup3/supΣsup−/sup ground state Author(s) Pastorek, Adam (UFCH-W) ORCID
Clark, V. H. J. (GB)
Yurchenko, S. N. (GB)
Civiš, Svatopluk (UFCH-W) RID, ORCID, SAIArticle number 108332 Source Title Journal of Quantitative Spectroscopy and Radiative Transfer. - : Elsevier - ISSN 0022-4073
Roč. 291, NOV 2022 (2022)Number of pages 9 s. Language eng - English Country GB - United Kingdom Keywords Atmospheric molecular species ; Molecular astrophysics ; NH high-resolution vibration-rotation molecular spectra ; NH rotational spectra ; NH radical ; Spectral (non-LTE) modelling Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry R&D Projects EF16_019/0000778 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFCH-W - RVO:61388955 UT WOS 000866229700006 EID SCOPUS 85135587615 DOI https://doi.org/10.1016/j.jqsrt.2022.108332 Annotation The NH radical is an extremely important specie in nitrogen chemical reaction networks, in the interstellar medium and atmospheric chemistry. Time resolved Fourier transform spectroscopy technique in the frequency range 10–13 µm has been applied for the measurement of a pure rotational spectrum of the NH free radical (NH) in the ground X3Σ− electronic state. Twelve high N (26–29) triplet-resolved pure rotation lines of NH were experimentally observed in the laboratory and compared with satellite ACE (Atmospheric Chemistry Experiment) solar data. In addition, discharge-generated vibration-rotation NH radical bands in the spectral range 1923–3571 cm−1 have been measured with a microsecond time resolution and spectral resolution of 0.02 cm−1. The spectra of the NH radical have been studied in two experimental arrangements. Firstly, in a pulsed positive column discharge of pure hydrogen-nitrogen mixture and secondly, in a discharge of nitrogen-ammonia mixture in the presence of argon buffer gas. Both production methods are described and compared. The population analysis of the experimental spectra was performed via modelling using the accurate MoLLIST line lists for NH. It was shown that laboratory data can be well reproduced by use of a mixture of the local-thermal-equilibrium (LTE) and non-LTE models corresponding to high temperatures (up to 8000 K and up to 6000 K rotational). Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2023 Electronic address https://hdl.handle.net/11104/0333220
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