PHONON-ASSISTED ENERGY TRANSFER IN MOLECULAR CRYSTALS
Loading...
Date
1983
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Phonon-assisted triplet energy transfer in molecular crystals is investigated with the technique of laser line-narrowing. Benzophenone (BP) in $Bp-d_{10}$ and $4,4^{\prime}$ dibromodiphenyl ether (DDE) have been selected as examples. A narrow-band pulsed dye-laser excites a subset of the molecular sites, leading to narrow phosphorescence emission at 2 K. As energy transfer occurs at higher temperature, the emission line broadens. Analysis of the temporal evolution of the spectral profile in the Inokuti-Hirayama $region^{1}$ provides a measurement of the energy transfer rate. The temperature dependence of such rates reveals the mechanism of phonon interaction with the molecular excited $state.^{2}$ Experimental results will be discussed in view of the increased low frequency phonon population in a soft molecular crystal. $^{1}$M. Inokuti and F. Hirayama, J. Chem. Phys. 43, 1978 (1965). $^{2}$S. K. Lyo, T. Holstein and R. Orbach, Phys. Rev. B18, 1637 (1978)
Description
Author Institution: Department of Chemistry, Brandeis University