OVERTONE AND COMBINATION BAND SPECTROSCOPY OF JET COOLED METHANOL
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Date
2001
Journal Title
Journal ISSN
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Publisher
Ohio State University
Abstract
Overtone spectra of jet-cooled methanol have been recorded from 5,000 to $14,000 cm^{-1}$ using Infrared Laser Assisted Photofragment Spectroscopy (IRLAPS) for the detection of the vibrationally excited molecules. In addition to the OH stretch overtones $(n\nu_{1})$, the major components of the spectra are the overtones of the CH stretch (up to $5\nu_{CH}$) as well as combinations of the OH stretch with the CO stretch $(n\nu_{1}+\nu_{8})$, the COH bend $(n\nu_{1}+\nu_{6})$, and both $(n\nu_{1}+\nu_{6}+\nu_{8})$. These data, together with photoacoustic data [1] up to $18,250 cm^{-1}$ and previously reported IRLAPS data [2] up to $22,166 cm^{-1}$ have been fit to an anharmonic Hamiltonian. In this Hamiltonian, the CH stretch vibrations are treated as a pair of local modes, $v_{a}$ and $v_{6}$ for $v_{CH} = 3$ and higher. The other modes are treated as the usual normal vibrations.
Description
[1] H.L. Fang, D.M. Meister, R.L. Swofford, J. Phys. Chem. 88, 405-409 (1984). [2] O.V. Boyarkin, L. Lubich, R.D.F. Settle, D.S. Perry, T.R. Rizzo, J. Chem. Phys. 107, 8409-8422 (1997).
Author Institution: Lab. de Chimie Physique Mol\'eculaire, INSTITUT DE CHIMIE PHYSIQUE MOLECULAIRE; Lab. de Chimie Physique Mol\'eculaire, UNIVERSITY OF AKRON; DEPARTMENT OF CHEMISTRY, UNIVERSITY OF AKRON
Author Institution: Lab. de Chimie Physique Mol\'eculaire, INSTITUT DE CHIMIE PHYSIQUE MOLECULAIRE; Lab. de Chimie Physique Mol\'eculaire, UNIVERSITY OF AKRON; DEPARTMENT OF CHEMISTRY, UNIVERSITY OF AKRON