Abstract
Analysis of the steady-state absorption/fluorescence spectra of several laser dyes in room temperature solution suggests that the fluorescing molecules, if initially formed in a vibrationally excited state, lose their excess energy surprisingly slowly, remaining significantly warm on a nanosecond time scale. A similar analysis of the steady-state absorption/fluorescence spectra of GaAs confirms that in this case the carriers are fully thermalized, possessing no excess energy when they recombine on a microsecond time scale. A classical model which accounts qualitatively for slow molecular cooling is presented. We conclude that rapid molecular photoconversion processes are likely to involve incompletely cooled (thermalized) excited states.
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