ELECTRONIC PREDISSOCIATION DYNAMICS OF CN(A) -Ne
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Date
1996
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Ohio State University
Abstract
The electronic predissociation $CN(A^{2}\Pi_{3/2, v=3})-Ne \rightarrow CN(X, v=7) + Ne$ was characterized using sequential pulse $B\leftarrow A\leftarrow X$ excitation of the complex. Pump and probe lasers were fixed on specific complex features, and the intensity of the OODR fluorescence signal was monitored as a function of the delay between the laser pulses. Single exponential fits to these data yielded lifetimes in the range of 100-170 ns for A state rotational levels in the range $1/2\leq j \leq 9/2$. Radiative decay occurs with a lifetime of $\approx 6 $ , and makes a negligible contribution to the decay of the CN(A)-Ne levels examined. Within the experimental error lilmits, the predissociation rates were linearly dependent on J(J+1). This behavior is characteristic of a mechanism that involves Coriolis coupling. However, the decay rate does not approach the radiative rate at the hypothetical J=0 limit, and it is clear that the dominant predissociation channel does not depend on Coriolis coupling. Extrapolation of the decay rate yields a lifetime of 175 ns for the non-rotating complex. This value is comparable to the lifetime of 91 ns reporting for CN(A, $v=3$) isolated in solid Ne matrix. Experimental details and a theoretical analysis of the predissociation mechanism will be presented.
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Author Institution: Department of Chemistry, Emory University