Abstract
Stability of defect-bound electrons in the phonon fields is discussed with particular attention to the different roles of short and long range parts of electron-phonon, electron-defect and defect-phonon interactions. The short range electron-phonon interaction triggers shallow-deep instability with stable and metastable states separated by a potential barrier. Extrinsic self-trapping, persistent photoconductivity and negative U effect are discussed in this context. With repulsive short range and attractive long range electron-defect or electron-hole interaction consisting of phonon=mediated as well as direct ones, there can occur separated self-trapping with broken parity. Dynamics of nonradiative recombination via a deep state and recombination induced defect reactions is described in terms of the accepting and reaction modes.
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