MICROWAVE – MILLIMETER-WAVE DOUBLE RESONANCE EXPERIMENTS ON Ar-CO
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Date
1994
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Publisher
Ohio State University
Abstract
A double resonance technique has been developed to extend the accessible range of cavity microwave Fourier transform spectrometers to millimeter-wave frequencies. The method uses a modulation scheme with pulsed microwave and continuous millimeter-wave radiation. This technique has been applied to measure the frequencies of low J b-type rotational transitions of the van der Waals dimer Ar-CO in the frequency range 70-90 GHz. This complements previous studies in the $infrared^{1}$ and $microwave^{2}$ regions which have shown that Ar-CO is a T-shaped complex undergoing large amplitude motions. The present work has resulted in a precise value for the A-rotational constant, initially obtained in the infrared work from combination differences. The experimental technique will be discussed and the results will be interpreted in terms of structural and dynamical parameters of the complex.
Description
$^{1}$ A. R. W. Mckellar, Y. P. Zeng, S. W. Sharpe, C. Witting, and R. A. Beaudet, J. Mol. Spectrosc. 153, 475 (1992). $^{2}$ T. Ogata, W. J\""{a}uger, I. Ozier, and M. C. L. Gerry, J. Chem. Phys. 98. 9399 (1993).
Author Institution: Department of Chemistry, The University of British Columbia
Author Institution: Department of Chemistry, The University of British Columbia