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Proceedings Paper

Vibrational energy transfer in the chemical energy regime using stimulated emission pumping
Author(s): Xueming Yang; Eunha Kim; Alec M. Wodtke
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Paper Abstract

The dependence of vibrational energy transfer on vibrational excitation has been studied using the stimulated emission pumping technique to efficiently prepare a large range of specific vibrational states of the nitric oxide molecule in its ground electronic state. Laser-induced fluorescence was used to detect collisionally relaxed NO. The self-relaxation rate constants of NO(v >> 1) were up to two hundred times larger than that of NO(v equals 1). Multiquantum relaxation was found to be important at high energy and was quantified at 3.8 eV. Theoretical explanations of our experimental results were attempted and it is shown that at vibrational energy up to approximately 3 eV the qualitative trends observed in these experiments such as: the mass effect and the linear dependence of the relaxation constant on v can be explained by Schwartz-Slawsky-Herzfeld theory. A simple explanation of the anomalously high NO self-relaxation rate is given. The large acceleration of the vibrational relaxation rate above 3.0 eV is coincident with the energetic onset of high energy (NO)2 isomer-complexes. More theoretical and experimental work is needed to explain the quantitative aspects of these observations.

Paper Details

Date Published: 1 April 1992
PDF: 17 pages
Proc. SPIE 1638, Optical Methods for Time- and State-Resolved Chemistry, (1 April 1992); doi: 10.1117/12.58151
Show Author Affiliations
Xueming Yang, Univ. of California/Santa Barbara (United States)
Eunha Kim, Univ. of California/Santa Barbara (United States)
Alec M. Wodtke, Univ. of California/Santa Barbara (United States)

Published in SPIE Proceedings Vol. 1638:
Optical Methods for Time- and State-Resolved Chemistry
Cheuk-Yiu Ng, Editor(s)

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