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The range of 40-kev Kr/sup 85/ ions in amorphous Al/sub 2/O/sub 3/ and in polycrystalline Al was measured. The range distribution in the polycrystalline Al showed an exponential behavior due to the crystalline structure. The existence of a channeling process was strongly suggested by the striking qualitative resemblance between experiment and calculation. (C.E.S.)
Piercy et al. (Wed,) studied this question.