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\~oIume 110, number 2 CHEMICAL PHYSICS LEl-fERS 21 September 1984 STIMULATED EMISSION AS A MAJOR CHANNEL FOR THE DEPOPULATION
 

Summary: \~oIume 110, number 2 CHEMICAL PHYSICS LEl-fERS 21 September 1984
STIMULATED EMISSION AS A MAJOR CHANNEL FOR THE DEPOPULATION
OF LASER-EXCITED STATES IN CONDENSED MEDIA *
V.A. AF'KARIAN
Departmerlr of Chemistry. Universit)~ of Gdiforka, him, Califomia 92717, USA
Rcccivcd 5 March 1981; in final form 11 April 1984
In condensed media, due to the high molecular densities, stimulated emission may become the dominant channel for
dcplction oi population in laserexcited states. The phenomenon is fair11rgeneral. The criteria necessary for such 3 process.
the specific cast of vibrational excitation in matri..-isolated CHxP, and some practical implications are considered.
I_ Introduction
Many modern kinetic measurements rely on initial
preparation of molecular states by laser excitation. In
these experiments it is imperative to know the exact
state preparation by the laser pulse, since this is as-
sumed as the initial condition for the kinetic evolu-
tion of the system. Analysis of the kinetic equations
for mdiativc energy transfer indicates that in con-
densed media. even for relatively mild pump fluences,
the initially excited state may equilibrate with others
via stimulated emission. Thus. the assumption that

  

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

 

Collections: Chemistry