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High-resolution vibration-rotational spectra and rotational perturbation of the OO-stretching (ν6) band of CH2OO between 879.5 and 932 cm−1

Abstract

We report the observation of a rotationally resolved ν6 band associated with the OO-stretching mode of the simplest Criegee intermediate, CH2OO, in range 879.5−932.0 cm−1 (11.37−10.73 μm) at optical resolution 0.0015 cm−1. The spectra were recorded with a tunable cw external-cavity quantum-cascade laser (EC-QCL) system coupled with a Herriott multipass absorption cell. Over one thousand lines were assigned to determine the rovibrational parameters of this mode. Rotational parameters A’, B’, and C’ and higher-order parameters ΔJ, ΔJK, ΔK, δJ, and δK were determined precisely. Rotational perturbations for Ka = 3, Ka = 6, and Ka ≥ 11 on high-J’ levels were observed. In particular, for Ka = 6, frequency shifts as a function of J’ showed an avoided crossing; the shifts were analyzed in terms of a Coriolis interaction between modes ν6 and ν8 of CH2OO. According to the distinct temporal profiles, lines of a hot band near 899.5 cm−1 were also identified.

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Publication details

The article was received on 27 Jul 2018, accepted on 14 Sep 2018 and first published on 15 Sep 2018


Article type: Paper
DOI: 10.1039/C8CP04780D
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    High-resolution vibration-rotational spectra and rotational perturbation of the OO-stretching (ν6) band of CH2OO between 879.5 and 932 cm−1

    P. LUO, Y. Endo and Y. Lee, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP04780D

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