The range of fast heavy particles in solids is determined by a sensitive method (removal of thin surface-layers by low energy sputtering) . The range distributions in various directions of copper single crystals are measured using Kr 85 ions of energies between 25 and 150 keV. The mean range in <111> fits the general range vs. energy relation given by LINDHARD and SCHARFF. In <100> and especially in <110>, the range distributions show long tails which increase the mean penetration of the krypton ions in these directions. These “super ranges” are caused by so-called stenons, i. e. ions which move in the structural “channels” of the f.c.c. lattice.
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