Analysis of line positions of the ν<SUB>6</SUB> band of <SUP>35</SUP>ClNO<SUB>2</SUB> around 411 cm<SUP>-1</SUP> - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Journal of Quantitative Spectroscopy and Radiative Transfer Année : 2023

Analysis of line positions of the ν6 band of 35ClNO2 around 411 cm-1

Résumé

The first investigation of the ν6 band of the 35ClNO2 isotopic species of nitryl chloride, located at 410.11824 (± 0.00007) cm-1 has been performed using a high resolution (0.00102 cm-1) Fourier transform spectrum recorded at the SOLEIL synchrotron source. This B-type band is rather weak but a long optical path was used and, during the spectrum recording, the nitryl chloride sample was kept at low temperature (221 K) in the optical cell. In this way, the rather strong ν23 difference band located at 422.6 cm-1, observed at 296 K during a previous investigation of the far infrared region [Orphal J, Morillon-Chapey M, Klee S, Mellau GC, Winnewisser M. J Mol Spectrosc 1998;190:101-6], and interfering with observation, could be strongly reduced. This first assignment of the ν6 band of 35ClNO2 was pursued up to high J and Ka quantum number values, J = 79 and Ka = 37. The ν6 band (expected to be of B-type) has a clearly unusual line intensity pattern, since the P branch is about twice as strong as the R-branch. Since the (weak) ν6 band is located close by to the strong A-type ν3 band located at 370 cm-1 [Anantharajah A, Kwabia Tchana F, Manceron L, Orphal J, Flaud JM. J Quant Spectrosc Radiat Transf 2020; 253:107,078], one could reasonably expect that the ν6 band borrows part of its intensity through the existence of a C-type Coriolis resonance that couples together the 61 ⇔ 31 interacting energy levels. However, during the 61 energy level computation, we could not evidence such resonance, and only a classical Watson's type A-type reduced rotational Hamiltonian, involving a single upper state, was used for this calculation.
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Dates et versions

insu-04472081 , version 1 (22-02-2024)

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F. Kwabia Tchana, Laurent Manceron, A. Perrin, A. Anantharajah. Analysis of line positions of the ν6 band of 35ClNO2 around 411 cm-1. Journal of Quantitative Spectroscopy and Radiative Transfer, 2023, 311, ⟨10.1016/j.jqsrt.2023.108760⟩. ⟨insu-04472081⟩
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