DISSOCIATION OF SMALL METHANOL CLUSTERS AFTER EXCITATION OF THE O-H STRETCH VIBRATION AT 2.7$\mu$
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Date
1991
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Ohio State University
Abstract
Molecular beam depletion spectroscopy has been utilized to study the O-H stretching vibrations in methanol dimer. A Nd:YAG laser pumped optical parameteric oscillator has provided tunable infrared radiation in the 2.7$\mu$ range to dissociate methanol dimer without contamination from larger clusters. Two absorptions have been observed at 3574.4 and 3684.1$cm^{-1}.$ The lower frequency band represents a red shift of $106.6 cm^{-1}$ from the monomer absorption and can be assigned to the excitation of the proton donor O-H stretch in the hydrogen bonded dimer. Measurement of the integrated absorption cross-section indicates a substantial enhancement in the proton donor relative to the monomer value.
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Author Institution: Max-Planck-Institut f\""{u}r Str\""{o}mungsforschung; Department of Chemistry, University of Illinois