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Title:High-resolution infrared spectroscopy slit-jet cooled hydroxymethyl radical(CH2OH): OH stretching mode
Author(s):Wang, Fang
Contributor(s):Nesbitt, David; Chang, Chih-Hsuan
Subject(s):Atmospheric science
Abstract:Rotationally resolved direct absorption spectra in the OH stretching mode were recorded using difference frequency generation infrared spectrometer and slit-jet supersonic discharge expansion source. The spectra are really complicated because of the following reasons: a) CH$_2$OH was generated by discharging the expansion mixed gas CH$_3$OH and Cl$_2$ in carrier gas 70\% Ne and 30\% He. Large signals for CH$_3$OH are overlapped with that for CH$_2$OH in the OH stretching mode. b) The large amplitude of COH torsion for CH$_2$OH splits each vibration state into two states labeled as ``+" and ``-". The ``+" state has energy levels with a 3:1 nuclear spin statistic ratio for \textit{K$_a$}=0$^+$/\textit{K$_a$}=1$^+$. The ``-" state has \textit{K$_a$}=0$^-$/\textit{K$_a$}=1$^-$ levels with 1:3 nuclear spin statistics. c) The OH stretch fundamental is a hybrid \textit{a/b}-type band. Both \textit{a}-type and \textit{b}-type bands were observed. As a result of the low rotational temperature and sub-Doppler linewiths, the spin-rotation structure was also resolved for \textit{b}-type transitions. The spectra were assigned and fit to a Watson A-reduced symmetric top Hamiltonian to improve the accuracy of rotational parameters for the ground vibration state and determine the rotational parameters for the OH stretch state. The spin rotational constants and the tunneling splittings for both ground and OH stretch state were also determined.
Issue Date:2014-06-17
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:Wang, F.; Nesbitt, D.; Chang, C. HIGH-RESOLUTION INFRARED SPECTROSCOPY SLIT-JET COOLED HYDROXYMETHYL RADICAL (CH2OH): OH STRETCHING MODE. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.TI03
Rights Information:Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License.
Date Available in IDEALS:2014-09-17

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