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Vibrational overtone spectroscopy of jet-cooled methanol from 5000 to 14 000 cm–1

J. Chem. Phys. 122, 044314 (2005); doi:10.1063/1.1833353

Published 10 January 2005

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David Rueda, Oleg V. Boyarkin, and Thomas R. Rizzo
Laboratoire de Chimie Physique Moléculaire, EPFL, Station-6, CH-1015 Lausanne, Switzerland

Andrei Chirokolava and David S. Perry
Department of Chemistry, The University of Akron, Akron, Ohio 44325-3601
Spectra of jet-cooled methanol in the overtone and combination region from 5000 to 14 000 cm–1 have been obtained by means of infrared laser-assisted photofragment spectroscopy. Many of the observed features are assigned to combination bands of the type nnu1 + nu6, nnu1 + nu8, and nnu1 + nu6 + nu8 (n = 1,2,3), where nu1 is the OH stretch, nu6 is the OH bend, and nu8 is the CO stretch. These bands show sharp torsion-rotation structure with features as narrow as 0.1 cm–1. We also observe CH stretch overtones that are weaker than the OH containing combination bands and lack distinct torsion-rotation structure above vCH = 2. The extent of observed structure on these bands allows us to place limits on the intramolecular vibrational energy redistribution decay rates in the upper vibrational states. We report a global fit of the observed band centers to a simple expression involving low-order anharmonicity constants. ©2005 American Institute of Physics.
History: Received 13 September 2004; accepted 25 October 2004; published 10 January 2005
Permalink: http://link.aip.org/link/?JCPSA6/122/044314/1
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KEYWORDS and PACS

Keywords
PACS
  • 33.20.Ea
    Infrared molecular spectra
  • 33.20.Tp
    Vibrational analysis (molecular spectra)
  • 33.20.Sn
    Rotational analysis (molecular spectra)
  • 33.15.Mt
    Molecular rotation, vibration, and vibration-rotation constants
  • YEAR: 2005

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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