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The classical multiple atom displacement theory of Kinchin and Pease is discussed in the light of more recent computer and experimental data. The inadequacy of an isotropic metal model to represent physical processes in a real crystal is emphasized. The relative importances of the crystal anisotropy and of the thermal spike anneal process are discussed. The interest of anisotropic experiments is pointed out.
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Lucasson et al. (1978) studied this question.
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