EIGENSTATE RESOLVED INFRARED AND MILLIMETER WAVE- INFRARED DOUBLE RESONANCE STUDY OF METHYLAMINE IN THE N-H STRETCH OVERTONE REGION
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Date
1996
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Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The infrared spectrum of methylamine, $CH_{3}NH_{2}$, was recorded in the region of the $\nu_{1} + \nu_{10}$ N-H stretching overtone ($6600 cm^{-1}$), using a molecular beam laser spectrometer with optothermal detection. This molecule is an interesting benchmark for the study of intramolecular vibrational energy redistribution (IVR) because of its two large amplitude internal motions: $CH_{3}$ rotation and $NH_{2}$ wagging that are coupled togethar. However this also makes assigning the spectrum a challenge due to its extreme congestion. The single photon spectrum yields a density of approximately 1000 lines/$cm^{-1}$. Millimeter wave-infrared double resonance has been used to isolate the contributions from a single ground state. Preliminary inspection of the double resonance spectrum suggests that the IVR rates are faster than those observed for molecules of comparable structure and size. $^{b}$ Analysis of the data is in progress, and further results will be presented at the conference.
Description
$^{a}$Supported by the German Academic Exchange Service (DAAD) $^{b}$Talk RK11, 1995.
Author Institution: Department of Chemistry, Princeton University; University of Bonn, Institut f\""{u}r Angewandte Physik, Princeton University
Author Institution: Department of Chemistry, Princeton University; University of Bonn, Institut f\""{u}r Angewandte Physik, Princeton University