Abstract
Polycristalline copper surfaces and germanium single crystals were bombarded with 1000 eV argon ions. The argon ions were produced by means of an electron current between a heated tungsten cathode and an anode at a potential of +300 V. The pressure of the argon gas was maintained at 10−3 mm Hg. The whole system could be evacuated to 10−6 mm Hg with an oil diffusion pump.
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