EFFECTS OF MATRIX CORRELATIONS ON INHOMOGENEOUS SPECTRAL DISTRIBUTIONS - RARE-GAS AND POLYMERIC SYSTEMS

A stochastic theory of dye-matrix interaction is used to interpret inh omogeneous absorption lines and pressure effects on hole-burning spect ra of free-base phthalocyanine doped into polymeric and rare gas matri ces. It is shown that a realistic description can only be obtained if correlations between the matrix units are taken into account. Whereas the inhomogeneous absorption band can be reproduced correctly by inser ting simple step-like dye-matrix and matrix-matrix correlation functio ns, more complicated forms are required to account for the hole-burnin g data. This leads to a possible new application of hole-burning spect roscopy, namely, the investigation of molecular arrangements on a nano scopic scale.