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Time-resolved coherent anti-Stokes Raman-scattering measurements of I2 in solid Kr: Vibrational dephasing on the ground electronic state
 

Summary: Time-resolved coherent anti-Stokes Raman-scattering measurements
of I2 in solid Kr: Vibrational dephasing on the ground electronic state
at 2.6­32 K
Tiina Kiviniemi, Jukka Aumanen, and Pasi Myllyperkiö
Department of Chemistry, P.O. Box 35, FIN-40014 University of Jyväskylä, Finland
V. A. Apkarian
Department of Chemistry, University of California, Irvine, California 92697-2025
Mika Petterssona
Department of Chemistry, P.O. Box 35, FIN-40014 University of Jyväskylä, Finland
Received 4 May 2005; accepted 8 June 2005; published online 18 August 2005
Time-resolved coherent anti-Stokes Raman-scattering CARS measurements are carried out for
iodine I2 in solid krypton matrices. The dependence of vibrational dephasing time on temperature
and vibrational quantum number v is studied. The v dependence is approximately quadratic, while
the temperature dependence of both vibrational dephasing and spectral shift, although weak, fits the
exponential form characteristic of dephasing by pseudolocal phonons. The analysis of the data
indicates that the frequency of the pseudolocal phonons is 30 cm-1
. The longest dephasing times
are observed for v=2 being 300 ps and limited by inhomogeneous broadening. An increase in the
dephasing rate of v=2 as the temperature is lowered to T=2.6 K is taken as a clear indication of
lattice-strain-induced inhomogeneity of the ensemble coherence. © 2005 American Institute of

  

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

 

Collections: Chemistry