PULSED LASER-MICROWAVE DOUBLE RESONANCE STUDY OF $SO_{2}CT-XT$ BAND
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Date
1990
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Ohio State University
Abstract
The $^{1}B_{2}-\widetilde{X}^{1}A_{1}$ system of $SO_{2}$ has been studied by the pulsed laser-microwave double resonance technique around the region 220nm. The present method, which detects changes of the ground state microwave absorption caused by the electronic transition induced by a pulsed tunable laser, provides rotationally selected and simplified spectra for the otherwise complicated electronic transition. By combining data of several microwave transitions used to monitor, we were able to determine rotational energy levels of many vibronic bands of the \~C state unambiguously even when they were severely perturbed; in some cases, rotational lines were found to be split into doublet. It is expected that systematic double resonance study of the vibronic bands is of great help to reveal the nature of the perturbations, whether they are due to highly excited vibrational levels of the ground electronic state or triplet states, and of the predissociation found below 218nm.
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Author Institution: Department of Pure and Applied Sciences, College of Arts and Sciences, The University of Tokyo