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We report an extensive set of experimental measurements on electric-field echoes in insulating and semi-insulating crystals. Previously suggested mechanisms cannot explain the results. In particular, three-pulse echoes with decay times T₁ of several hours have been observed at low temperatures in semi-insulating II-VI compounds. We propose a mechanism based upon the redistribution of trapped electronic space charge.
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Shiren et al. (1973) studied this question.
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