Abstract
It is shown that energetic bombardment of (11 3 1) surfaces of copper single crystals with either Ne +, Ar +, Cu +, Kr + or Xe + ions results in the formation of regular geometric sputter-etch pits from which regular pyramids emerge during the subsequent pit enlargement. Similarly, energetic Ar + bombardment of (11 3 1) surfaces of single crystal nickel, palladium, silver, iridium and gold produces regular pits and pyramids. It is shown that, within certain parameters of ion bombardment, crystallography is the all important condition necessary for production of pits and pyramids. The presence of impurity is unnecessary.
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