Abstract
Iron films of 500, 700, and 1500 A thickness evaporated on pyrolytic graphite were bombarded with deuterium ions at different energies in the temperature range of 300 to 800 K. The Fe sputtering yield was measured by means of laser-induced fluorescence and the depth distribution of the Fe on the graphite substrate was determined by Rutherford backscattering spectroscopy (RBS). The results show that at room temperature the sputtering yield corresponds to the pure iron value. During 6 keV D3+ irradiation, the Fe sputtering yield decreases strongly between 700 K and 800 K for the 500 A films. Upon subsequent cooling and sputtering at room temperature it rises to the original value. This can be explained by ion-induced temperature-dependent diffusion and segregation of carbon to the iron surface, which is also sustained by in situ RBS depth profile measurements. The influence of the fraction of energy
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