Journal
CANADIAN JOURNAL OF CHEMISTRY
Volume 82, Issue 6, Pages 880-884Publisher
CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
DOI: 10.1139/V04-072
Keywords
DC slicing imaging; OCS; photodissociation; hot-band excitation
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The photodissociation dynamics of OCS at 288 nm has been investigated using the DC (direct current) slice imaging technique, which is a recently developed high-resolution slicing approach that directly measures the central slice of the photofragment distribution in imaging experiments. By analyzing a DC sliced image of S(D-1(2)) photofragments we observe dissociation originating from OCS molecules excited up to v(2) = 4 in the molecular beam. The measured translational energy distribution was used to determine the branching ratio for the contribution from each initial bending state (0 v(2) 0) of OCS and relative photodissociation cross section ratios compared to v(2) = 1. Large negative anisotropy parameters determined as a function of the S(D-1(2)) fragment recoil speed indicate that the photodissociation of OCS at 288 nm occurs exclusively from the 1(1)A''((1)Sigma(-)) bending excited potential surface that can be accessed through a perpendicular transition.
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