Effects of the surface Miller index on the resonant neutralization of H^- near Ag surfaces
Abstract
We compare the resonant neutralization dynamics of Hydrogen anions in front of plane Ag surfaces of symmetries (111) and (100) using a wave-packet propagation method. For Ag(111), the population of a Shockley surface state, that exists inside the projected L-band gap retards the electron decay into the bulk along the direction normal to the surface. In contrast, for Ag(100), the surface state being degenerate with the valence band facilitates more rapid electron decay. Primarily, this difference in the decay pattern shows strong implications in the survival of 1 keV H^- ions specularly scattered from these surfaces. Scattering off the Ag(111) surface results in about an order of magnitude higher ion survival as a function of the exit angle with respect to the surface plane compared to that off Ag(100). Results for Ag(111) show good agreement with measured data [Guillemot and Esaulov, Phys. Rev. Letts. 82, 4552 (1999)].
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MAR.R1190C