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The electroluminescence near the metal-insulator contacts is examined in four alkali iodide crystals. The instantaneous light emission is studied as a function of the electric field and of the temperature. The results obtained are in agreement with a recent avalanche-multiplication theory. The observed effect supports the existence of impact-ionization processes in alkali halide crystals at low temperatures and the formation of potential barriers at the metal-insulator interface.
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C. Paracchini (1973) studied this question.
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