ROTATIONAL ANALYSIS OF THE MM-WAVE SPECTRUM OF THE LOWEST TWO TORSIONAL EXCITED STATES OF DIMETHYL ETHER, $CH_{3}$ $OCH_{3}$
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Date
1997
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Publisher
Ohio State University
Abstract
The rotational spectra of the two lowest torsional excited states of dimethyl ether were investigated between 262 and 323 GHz with the new fast scan subimillimeter spectroscopic technique (FASSST). Initial assignments of R.- and Q-transitions were based on the analysis of the microwave $data^{m}$ with an effective rotational $Hamiltonan^{n}$ and on the $\rho$ and $\beta$ parameters from the vibrational ground state. Further assignments were made as the analysis progressed. The splitting between the torsional sublevels is about 30 times larger than in the ground state. Transitions involving energy levels up to $J = 40$ and $K_{a} = 6$ were assigned. The frequencies could be fit to a dimensionless standard deviation about 2.5.
Description
$^{m}$J. R. During, Y. S. Li and P. Groner, J. Mol. Spectrose. (1976) 62 159-174. H. Lutz and H. Dreizler, Z. Naturforsch, Part A (1978) 33, 1498--1510. $^{n}$P. Groner, submitted.
Author Institution: Department of Chemistry, University of Missouri; Department of Physics, Ohio State University
Author Institution: Department of Chemistry, University of Missouri; Department of Physics, Ohio State University