Rotational spectroscopy in the v3 = v6 = 1 and v6 = 2 vibrational states of CH35Cl3
| Autor: | Roman A. Motiyenko, Laurent Margulès, Petr Pracna, Adina Ceausu-Velcescu |
|---|---|
| Přispěvatelé: | LAboratoire de Modélisation Pluridisciplinaire et Simulations (LAMPS), Université de Perpignan Via Domitia (UPVD), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Physique Moléculaire aux Interfaces (PMI), Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Radiation Overtone Resonance 02 engineering and technology Flory–Huggins solution theory 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Standard deviation 010309 optics Vibration 0103 physical sciences Extremely high frequency Rotational spectroscopy [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] Atomic physics 0210 nano-technology Spectroscopy ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of Quantitative Spectroscopy and Radiative Transfer Journal of Quantitative Spectroscopy and Radiative Transfer, 2020, 250, pp.107006. ⟨10.1016/j.jqsrt.2020.107006⟩ Journal of Quantitative Spectroscopy and Radiative Transfer, Elsevier, 2020, 250, pp.107006. ⟨10.1016/j.jqsrt.2020.107006⟩ |
| ISSN: | 0022-4073 |
| DOI: | 10.1016/j.jqsrt.2020.107006⟩ |
| Popis: | The overtone v6 = 2 (~520 cm−1) and combination v3 = v6 = 1 (~627 cm−1) vibrational levels of chloroform CH35Cl3 have been studied by millimeter wave spectroscopy, in the regions 150-330 and 360-660 GHz, corresponding to J = 22-49 and 55-99. Like the v6 = 1 fundamental vibration, the v3 = v6 = 1 combination level has an accidentally small value of C-B-Cζ ~ −0.0029 cm−1. Hence, a global q22 resonance (Δk = Δl = ±2) connects the (k-1, l6 = -1) and (k+1, l6 = +1) sublevels. As a consequence, several resonant q12 (Δk = ±1, Δl = ∓2) crossings occur, which enabled the precise determination of the q12 interaction parameter for this state. Altogether, 1182 rotational transitions in the v3 = v6 = 1 combination level have been measured and fitted, with a standard deviation of 41.2 kHz. For the v6 = 2 (A1+E) overtone level, the combined effects of the q22 and q12 l-type interactions induce resonant crossings between the (k, l6 = 0)/(k+1, l6 = -2) pairs of levels, for a large variety of k values. Altogether, 1463 rotational transitions in the (l6 = 0) A1 sublevel and 2924 rotational transitions in the (l6 = ±2) E sublevels, together with nine perturbation-allowed transitions induced by the q12 (Δk = ±1, Δl = ∓2) interaction, have been measured and fitted, with a global standard deviation of 41.4 kHz. This resulted in the first accurate determination of the molecular constants of this overtone level. |
| Databáze: | OpenAIRE |
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