Abstract
A study has been made of the light emission induced by impact of 2 to 10 keV H + and He + on a clean copper surface. The emission includes spectral lines from scattered projectiles and a broad band that appears to emanate from the target. All emissions are unpolarized. Line emissions from the projectiles are broadened by Doppler effects; a simple model is presented to explain the general form of this line shape. In general the intensity of the line emission increases with projectile energy and also with increasing angle of incidence on the surface. The broad band excited in the metal has a shape that is invariant with impact energy and angle of incidence; the intensity also increases with impact energy and angle of incidence.
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