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17 November 1995 Chemical Physics Letters 246 (1995) 139-144
 

Summary: ELSEVIER
17 November 1995
Chemical Physics Letters 246 (1995) 139-144
CHEMICAL
PHYSICS
LETTERS
Photo-stationary state of UV pumped matrix isolated 0 2
A.V. Danilychev, V.A. Apkarian
Department of Chemistry, University of California, Irvine, CA 92717, USA
Received 24 July 1995; in final form 5 September 1995
Abstract
The 193 nm excitation of 02 in crystalline Ar and Kr leads to a photo-stationary state, whereby = 50% of the population
is transferred from O2(X3 E~) to a(1Ag). A kinetic analysis yields absorption cross sections of = 10-21 cm2, from X and a
states, and establishes the final states as ,~(3Au) and the repulsive 11] surface, respectively. The P~~ X transition is
enhanced = 3 orders of magnitude in the solid, by borrowing intensity from the 3I] ,-- X transition. Only molecules isolated
at defect sites, undergo permanent dissociation. Substitutionally isolated 02 does not dissociate at excess energies ~<2.5 eV.
1. Introduction
Various aspects of photodynamics of molecular
oxygen isolated in solid matrices have been studied
in some detail [1-14]. The bulk of these studies have

  

Source: Apkarian, V. Ara - Department of Chemistry, University of California, Irvine

 

Collections: Chemistry