Abstract

We give a short overview of the selective spectroscopy of organic molecules in solid solutions, starting from Shpol'skii matrices up to single molecule spectroscopy. We discuss the general principles of selective spectroscopy and different applications of this technique to molecular and solid-state studies. We examine in more detail two new fields to which we have contributed: persistent spectral hole burning in Langmuir-Blodgett (LB) films and the study of individual molecules. We show how persistent spectral hole burning provides information about structure and dynamics of LB films and how energy transfer can be studied in concentrated films. We probed the dynamics of the LB matrix as a function of the depth of the dye in a multilayer

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