ANALYSIS OF THE ROTATIONAL SPECTRUM OF DIMETHYL ETHER
Loading...
Date
1989
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The spectrum of the ground torsional state of dimethyl ether has been measured in the frequency range 100. 600 GHz covering rotational states up to $J=25$ and $K=5$. Over 700 torsional splittings from -250 rotational lines were analyzed using a PAM Hamiltonian. A total of 4 parameters were varied in a least squares fit using higher order Van Vleck perturbation terms. The free parameters included the torsional barrier, $V_{3}$, independent a- and b-type rotation-torsion interaction parameters $Q_{a}$ and $Q_{b}$, and the C rotational constant. The RMS of the fit was $<200 kHz$. Because of the parameterization of the Hamiltonian, this method should be applicable to other internal rotor molecules of this symmetry.
Description
Author Institution: Department of Physics, Duke University