TORSION-ROTATION ANALYSIS OF TORSIONAL COMBINATION BANDS BUILT ON THE METHANOL OH STRETCH OVERTONE: $2\nu_{1}$, $2\nu_{1}+\nu_{12}$ AND $2\nu_{1}+2\nu_{12}$
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Date
2001
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Publisher
Ohio State University
Abstract
The spectrum of the first overtone OH stretch band $(2\nu_{1})$ in jet-cooled methanol has been measured using Infrared Laser Assisted Photofragment Spectroscopy (IRLAPS) and detailed assignments have been made. In addition to the torsional fundamental band $(\delta v_{t}=0)$ it was possible to observe and assign the torsional combination band with ($\delta v_{t}=1$ and 2). These transitions are very week but can be clearly resolved in the spectra. In total, 131 transitions reaching 19 different K levels in the $2\nu_{1}$ state have been fit to a global torsion-rotation Hamiltonian and the leading torsion-rotation parameters have been determined. Assignments for the much weaker and irregular torsional band structure for $3\nu_{1}+\nu_{12}$ and $3\nu_{1}+2\nu_{12}$ are in progress.
Description
Author Institution: INSTITUT DE CHIMIE PHYSIQUE MOLECULAIRE, EPFL, CH - 1015, LAUSANNE; Department of Chemistry, UNIVERSITY OF AKRON, AKRON, OHIO 44325