MICROWAVE SPECTRUM OF THE XE-PROPYNE VAN DER WAALS COMPLEX
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Date
1996
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The microwave spectrum of the Xe-propyne Van der Waals has been recorded between 4-22 GHz, using a newly-developed pulsed molecular beam Fourier transform microwave spectrometer incorporating automated frequency scanning. The spectra of five isotopomers, involving $^{129}$Xe, $^{131}$Xe, $^{134}$Xe, and $^{135}$Xe, were observed in natural abundance. The geometry of Xe-propyne is T-shaped, comparable to that of Ar-$propyne^{b}$. Hindered internal rotation of the methyl group in propyne splits the levels into A and E species. The A species transitions could be analysed using predicious from an on-going analysis of the infrared $spectrum^{c}$. The microwave spectrum was analysed using a rotation-internal rotation Hamiltonian. The barrier to internal $V_{3}$ was found to be $\sim$ 22$cm^{-1}$, comparable to that of Ar-propyne.
Description
$^{a}$Present address: Department of Chemistry, University of Alberta, Edmonton, Alta, Canada, T6G, 2G2 $^{b}$ T. A. Blake et al, J. Chem. Phys. 98, p. 6031 (1993) $^{c}$ R. O. Watts, T. A. Blake, P. Muino and D. F. Eggers| private communication
Author Institution: Department of Chemistry, University of British Columbia; Department of Chemistry, University of washington
Author Institution: Department of Chemistry, University of British Columbia; Department of Chemistry, University of washington