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Issue 40, 2018
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High-resolution vibration–rotational spectra and rotational perturbation of the OO-stretching (ν6) band of CH2OO between 879.5 and 932.0 cm−1

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Abstract

We report the observation of a rotationally resolved ν6 band associated with the OO-stretching mode of the simplest Criegee intermediate, CH2OO, in the range of 879.5–932.0 cm−1 (11.37–10.73 μm) at an optical resolution of 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 the ν6 band. 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.

Graphical abstract: High-resolution vibration–rotational spectra and rotational perturbation of the OO-stretching (ν6) band of CH2OO between 879.5 and 932.0 cm−1

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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., 2018,20, 25806-25811
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    High-resolution vibration–rotational spectra and rotational perturbation of the OO-stretching (ν6) band of CH2OO between 879.5 and 932.0 cm−1

    P. Luo, Y. Endo and Y. Lee, Phys. Chem. Chem. Phys., 2018, 20, 25806
    DOI: 10.1039/C8CP04780D

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