The Effect of Pressure, Time and Concentration in Hole-Burning Studies

The study of spectral diffusion of an electronic transition of a molecule in an amorphous host yields information on the structural relaxation of the system. Although this phenomenon has recently been investigated by many groups, no unambiguous picture has yet emerged as regards the dynamics of glasses at low temperature. Furthermore, the relation between spectral diffusion and energy transfer resulting from a concentration increase has so far not been addressed.