A review is presented of papers devoted to studies of the photophysical and photochemical processes that appear when powerful resonance optical excitation acts in solutions of polyatomic compounds of polymethine and pyrilium classes and in molecular layers. The processes that have been studied include intramolecular localization of excitation energy, one- and two-step photostereoisomerization of polymethine dyes, structural rearrangement of a pyrilium-moleculeâ??solvate complex, generation of stimulated emission by unstable photoisomers, induced bleaching in an inhomogeneously broadened medium, stepped transitions with absorption, induced anisotropy of absorption and induced birefringence, two-photon absorption, and photostimulated transformation of the components of a molecular layer.© 2003 Optical Society of America

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