Dynamics of Energy Transport in Molecular Crystals: The Picosecond Transient-Grating Method

Abstract

Energy transport in molecular solids is investigated using a picosecond transient-grating technique. A model is presented which directly relates the rate of energy transport to the experimental observable. The diffusion coefficient for singlet electronic excitation transport is reported for pentacene in $p$-terphenyl. Acoustically induced optical absorption effects are also observed.