Abstract
Hydrogen and helium ion beams with energies of 1 to 15 keV have been reflected from Cs-covered Ni surfaces at normal incidence. For hydrogen there are surface peaks in the positive fraction and surface minima in the negative fraction, a result very different from that observed with other materials. The charged fractions of both hydrogen and helium depend on the thickness of the Cs layer. Some results for scattering of hydrogen at glancing angles are presented.
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