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Vibrational relaxation in the excited electronic state

✍ Scribed by V. V. Hizhnyakov

Publisher: John Wiley and Sons
Year: 1982
Tongue: English
Weight: 618 KB
Volume: 114
Category: Article
ISSN: 0370-1972
DOI: 10.1002/pssb.2221140251

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✦ Synopsis

Abstract

A theory of the temporal evolution of the distribution of the configurational coordinate in the excited electronic state of an impurity centre of a crystal, allowing for the process of pulse excitation, is proposed. The lattice vibrations are considered to be harmonic and the quadratic vibronic interaction is taken into account. In this model relaxation is caused by the dephasing of phonons conditioned by their dispersion. Formulas are obtained relating the relaxation characteristics regarded with the dynamical Green's function. The present solution takes exactly into consideration the effect of mixing normal modes at electronic transition and it describes the influence of quantum effects upon the classical turning points of the configurational coordinate. The results of the theory are illustrated with the numerical calculations of the distribution of configurational coordinate and optical spectra.

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