Abstract
A theoretical model is presented which describes quantitatively the elimination of the inhomogeneous broadening in luminescence spectra of inpurity centres on site-selective laser excitation. The model explains our experimental data showing a remarkable dependence of the excitation selectivity on the excitation frequency: there is a gradual disappearance of the selectivity upon increasing the excitation frequency within the 0-0 transition band of various impurity porphyrins in amorphous matrices.
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