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Proceedings Paper

Orientation and molecular orbital dependences in electronic relaxation collisions studied through van der Waals complexes
Author(s): L. Lapierre; P. Y. Cheng; Shan Shan Ju; Y. M. Hahn; Hai-Lung Dai
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Paper Abstract

The orientation dependence in the spin changing collisions C2H2O2(S1)+AryieldsC2H2O2(T1)+Ar and C2H2(S1)+AryieldsC2H2(T)+Ar has been examined by time-resolved laser induced fluorescence studies of the intersystem crossing rates in the C2H2O2-Ar and C2H2-Ar complexes with different isomeric structures. It was found that when Ar interacts primarily with the n(O) orbital the S1yieldsT1 transition rate is about two orders of magnitude faster than that induced by Ar interacting primarily with the (pi) *(CO) orbital. On the other hand, the studies in acetylene show that the Ar induced intersystem crossing rate is nearly identical for both the (pi) and (pi) * orbitals.

Paper Details

Date Published: 1 April 1992
PDF: 12 pages
Proc. SPIE 1638, Optical Methods for Time- and State-Resolved Chemistry, (1 April 1992); doi: 10.1117/12.58146
Show Author Affiliations
L. Lapierre, Univ. of Pennsylvania (United States)
P. Y. Cheng, Univ. of Pennsylvania (United States)
Shan Shan Ju, Univ. of Pennsylvania (United States)
Y. M. Hahn, Univ. of Pennsylvania (United States)
Hai-Lung Dai, Univ. of Pennsylvania and National Taiwan Univ. (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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