Effect of parallel velocity on charge fraction in ion-surface scattering
1983; Elsevier BV; Volume: 126; Issue: 1-3 Linguagem: Inglês
10.1016/0039-6028(83)90766-5
ISSN1879-2758
AutoresJ.N.M. Van Wunnik, R. Brako, Kenji Makoshi, D. M. Newns,
Tópico(s)Mass Spectrometry Techniques and Applications
ResumoThe negative charge fraction in proton scattering from Cs-covered W(110) is found experimentally to be a strong function of parallel velocity V as well as perpendicular velocity v⊥ entering in previous theoretical treatments. Theory shows that V may be taken into account by displacing the Fermi sphere in existing theory by Q=mV. A simple model and a more complete calculation explain the H+ data. Extension to the case of Na atomic beams on clean W(110) shows that the V-effect is too small to explain discrepancies between theory and experiment at low T.
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