This book is the first detailed and comprehensive guide to the theory of optical band shape of guest-molecule-doped crystals, polymers and glasses. Its main focus is on the dynamics of a single molecule, measured with the help of a train of photons emitted at random time moments.

The main topic in this book is the low temperature selective spectroscopy of impurity centers. It deals not only with the well developed methods of selective spectroscopy of molecular ensembles such as spectral hole-burning, fluorescence line-narrowing and femtosecond photon echoes, but also new methods of nanospectroscopy such as single-molecule spectroscopy. Both the ory and experimental data are discussed. Theory united with experimental data enables one to organize the experimental facts. This organization is of great importance, especially for young researchers and students, because it...