Abstract
During Ne + bombardment of Al, 8 different spectral lines of Al I were observed. The intensities were found to depend on the presence of oxygen, the oxygen being in part adsorbed at the surface and in part recoil-implanted beneath the surface. A model is presented in which the oxygen dependence is related to resonance electron transfer between sputtered Al atoms and the target surface. The same model also accounts for the oxygen dependence of the yields of the secondary ions Al +, Al 2+, and Al 3+.
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