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Electron states of a B center at a dislocation in AgBr

The effective mass method is used in the continuum approximation to calculate the electron states of a B center (a negative silver ion located at an anion lattice site) in a regular AgBr crystal and at a dislocation. It is shown that the B + and B centers are thermally unstable in the bulk of the crystal. Their stability increases strongly when they are located in the core of a dislocation. Three-electron B − centers, which do not exist in the bulk of a crystal, are predicted to form at dislocations. The possibility that B centers at dislocations participate in the formation of an internal latent photographic image is discussed