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Summary: Volume 171, number $6 CHEMICAL PHYSICS LETTERS I7 August 1990
Photodissociation of F2 in crystalline krypton:
effect of molecule-lattice prealignment
H. Kunttu and V.A. Apkarian
Institutefor Surface and Interface Science, Department of Chemistry, Universityof California, Irvine, CA 92717, USA
Received 20 April 1990;in final form I June 1990
Photodissociation studies of F2 isolated in crystalline krypton are reported. At an excess energy of I. 16 eV, the dissociation
quantum yield is 12%.The quantum yield reaches unity for excess energies above 2.5 eV. At 4 K, dissociation probabilities are
higher than at 12 K. This inverse temperature dependence is ascribed to prealignment of the molecule along a reaction cone of
the cage.
1. Introduction
Orientational effects can be expected to play a sig-
nificant role in reactive dynamics in crystalline me-
dia. Prealignment of reagents by the lattice, or guid-
ing of reagents through preferred directions in the
ordered lattice are possible sources of such effects.
As a prototype of solid state reactions, we consider
the photodissociation of small molecules isolated in
a crystalline lattice. In such a process, we may sus-
pect that the relative molecule-lattice prealignment
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