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ELSEVIER Chemical Physics 217 (1997) 99-106 Vibron-mediated electronic relaxation in crystalline chlorine
 

Summary: Chemical
Physics
ELSEVIER Chemical Physics 217 (1997) 99-106
Vibron-mediated electronic relaxation in crystalline chlorine
Delony Logan a, Charles A. Wight a,*, V.A. Apkarian h
a Department of Chemistry, University of Utah, Salt Lake City, UT 84112, USA
b Department of Chemistry, University of California, Iroine, CA 92697, USA
Received 19 August 1996
Abstract
Luminescence decay of thin solid films of molecular chlorine exhibit distinctly non-exponential temporal behavior
following pulsed ultraviolet laser excitation. The temporal characteristics are dependent on sample temperature and laser
fluence in the range 11-80 K. This behavior is attributed to internal conversion from the first excited M(3rl2u) electronic
state to the ground state, which is accelerated by phonons and localized vibrational excitons (vibrons), This unusual
mechanism of electronic relaxation is consistent with a recent theoretical model for the mechanism of explosive desorption
of cryogenic films.
1. Introduction
Laser vaporization of solid targets is an effective
technique for generating gas phase atoms and
molecules having translational energies in the range
of several electron volts. This can be a useful method

  

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

 

Collections: Chemistry