Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 26: Oxides and insulators: Clean surfaces
O 26.6: Vortrag
Dienstag, 23. März 2010, 11:45–12:00, H40
Diffraction of fast light atoms and molecules during grazing scattering from a KCl(001) surface — •Marco Busch, Uwe Specht, and Helmut Winter — Humboldt-Universität zu Berlin, Institut für Physik, Newtonstraße 15, D-12489 Berlin, Germany
Fast light atoms and molecules with energies from 200 eV up to several keV are grazingly scattered from a clean and flat KCl(001) surface. For scattering along low-indexed axial channels, we observe defined diffraction patterns in the angular distributions for scattered projectiles. The experimental results for the scattering of H, D, 3He, and 4He atoms as well as H2, D2, and HD molecules can be ascribed to atom diffraction with de Broglie wavelengths as low as about 10−3 Å. From the evaluation of diffraction patterns we derive the widths of axial channels and the corrugation of the interaction potential across these channels. Our analysis is based on a semiclassical model using the hard-wall approximation and individual potentials for the interaction of the atomic projectiles with the atoms of the topmost surface layer of the surface.