Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1686180 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2011 | 5 Pages |
Abstract
Fast He atoms with energies from 200Â eV up to 16Â keV are scattered under grazing polar angles of incidence from a flat and clean KCl(0Â 0Â 1) surface. For scattering along low-index directions (axial surface channeling) we observe pronounced peaks in the angular distributions of scattered projectiles which can be attributed to rainbow scattering. From classical and semiclassical trajectory calculations based on individual Hartree-Fock pair and density functional theory (DFT) potentials, we obtain corresponding rainbow angles for comparison with the experimental data. The calculations were performed taking into account the rumpling of K and Cl in the topmost surface layer. Fair agreement with the experimental data is found for scattering along ã1Â 0Â 0ã for DFT as well as individual pair potentials calculated from Hartree-Fock wave functions.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
U. Specht, M. Busch, J. Seifert, H. Winter, K. Gärtner, R. WÅodarczyk, M. Sierka, J. Sauer,