Phys. Rev. Lett. 89, 196102 (2002) [4 pages]Charge Exchange in Li Scattering from Si SurfacesReceived 29 March 2002; published 17 October 2002 Neutral fractions are measured for 4 keV 7Li+ scattering from clean, hydrogen-covered, and cesiated Si surfaces. The neutral fraction in scattering from clean Si is ∼26% and it decreases with hydrogen adsorption. When Cs is adsorbed on Si, the neutral fraction does not distinguish the local potential at the Cs sites from the Si sites, unless hydrogen is coadsorbed. These results demonstrate that resonant charge transfer occurs due to coupling of the Li ionization level with the dangling bond surface states, and that the influence of the dangling bonds extends beyond the local scattering sites. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.196102
DOI:
10.1103/PhysRevLett.89.196102
PACS:
68.49.Sf, 73.90.+f, 79.20.Rf
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