Abstract
The spectral line-broadening deriving from anharmonic interactions between vibrational levels of the one electronic state is considered and expressions describing the dependence on vibrational energy are derived. For progressions in a pseudo-localized phonon mode in mixed crystal phosphorescence spectra, approximately linear dependence on the number of quanta is observed. It is proposed that for isolated molecules of the type benzene, and naphthalene, only at very high vibrational energies can anharmonicity contribute to the linewidths.
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