INVERSION MOTIONS IN THE DIMETHYL ETHER--CARBON DISULFIDE DIMER
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Date
2005
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The rotational spectrum of the 1:1 dimer formed between dimethyl ether (DME) and CS$_2$ has been assigned using Fourier transform microwave spectroscopy. The spectrum shows tunneling splittings of approximately 180 MHz in the $c$-type transitions and smaller splittings of a few hundred kilohertz in the $a$-type transitions. The splittings are attributed to a motion of the CS$_2$ between the lone pairs of the DME, causing an inversion of the $c$-component of the dipole moment. The $\Delta E(0^- - 0^+)$ splitting between the two tunneling states is $90.3411(14)$ MHz. The $B$ and $C$ rotational constants for the two states were fit separately, along with an average $A$ rotational constant, giving values of $A = 8099.5906(12)$ MHz, $B_0 = 604.67510(18)$ MHz, $B_1 = 604.65215(18)$ MHz, $C_0 = 582.50781(23)$ MHz, and $C_1 = 582.55142(23)$ MHz. A barrier to the tunneling motion has been estimated using both ab initio techniques and the one dimensional model of Meyer.}, \textbf{76} (1979) 266.} Dipole moment components of $\mu_a = 0.961(1)$ MHz, $\mu_c = 1.104(1)$ MHz, and $\mu_{total} = 1.464(1)$ MHz have been measured and are also consistent with the CS$_2$ interacting with a DME lone pair.
Description
{R. Meyer, \textit{J. Mol. Spectrosc.
Author Institution: Department of Chemistry, Eastern Illinois University, 600 Lincoln Ave.,; Charleston, IL 61920 USA
Author Institution: Department of Chemistry, Eastern Illinois University, 600 Lincoln Ave.,; Charleston, IL 61920 USA