TY - JOUR
T1 - High-resolution vibration-rotational spectra and rotational perturbation of the OO-stretching (ν 6 ) band of CH 2 OO between 879.5 and 932.0 cm -1
AU - Luo, Pei Ling
AU - Endo, Yasuki
AU - Lee, Yuan-Pern
N1 - Publisher Copyright:
© 2018 the Owner Societies.
PY - 2018/10/28
Y1 - 2018/10/28
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85055075318&partnerID=8YFLogxK
U2 - 10.1039/c8cp04780d
DO - 10.1039/c8cp04780d
M3 - Article
C2 - 30283933
AN - SCOPUS:85055075318
SN - 1463-9076
VL - 20
SP - 25806
EP - 25811
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
IS - 40
ER -