Overview

In crystals as diverse as sodium chloride, silicon dioxide, solid xenon, pyrene, arsenic triselenide and silver chloride, the fundamental electronic excitation (exciton) is localized within its own lattice distortion field very shortly after its creation. This book discusses the structure of the self-trapped exciton (STE) and its evolution along the path of its return to the ground state or to a defect state of crystal. A comprehensive review of experiments on STEs in a wide range of materials has been assembled, including extensive tables of data. Throughout, emphasis is given to the basic physics underlying various manifestations of self-trapping. The role of the spontaneous symmetry-breaking or ""off-centre"" relaxation in STE structure is examined thoroughly, and leads naturally to the subject of lattice defect formation as a product of STE relaxation. The theory of STEs is developed from a localized, atomistic perspective using self-consistent methods adapted from the theory of defects in solids.

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9783540559061

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