Non-linear Spectral Effects in Films and Crystals of Polar Molecules

Abstract

The paper addresses the spectroscopic peculiarities of polar molecular crystals and films of dimethylaminebenzylidene-1,3-indandione (DMABI). Specific visible fluorescence bands for various modifications of the system are discovered. They are identical for all excitation conditions and seem to be correlated with the structural organization of the media. The infrared excitation of these bands is shown to be a two-step process which turns into the saturating regime at higher intensities.