AVS 47th International Symposium
    Surface Science Thursday Sessions
       Session SS3-ThM

Paper SS3-ThM3
Helium Atom Scattering Study of the Surface Structure and Dynamics of in situ Cleaved MgO(001) Single Crystals@footnote 1@

Thursday, October 5, 2000, 9:00 am, Room 210

Session: Surface and Interface Structure II
Presenter: J.G. Skofronick, Florida State University
Authors: J.G. Skofronick, Florida State University
G. Benedek, Dipartimento di Fisica dell'Universita'
G. Brusdeylins, Max-Planck-Institute fuer Stroemungsforschung, Germany
D. Schmicker, Max-Planck-Institute fuer Stroemungsforschung, Germany
S. Schmidt, Max-Planck-Institute fuer Stroemungsforschung, Germany
V. Senz, Max-Planck-Institute fuer Stroemungsforschung, Germany
J.P. Toennies, Max-Planck-Institute fuer Stroemungsforschung, Germany
F. Traeger, Max-Planck-Institute fuer Stroemungsforschung, Germany
R. Vollmer, Max-Planck-Institute fuer Stroemungsforschung, Germany
Correspondent: Click to Email
A high resolution helium atom scattering study on the surface structure and dynamics of in situ cleaved MgO(001) single crystals, under ultra high vacuum conditions, in both high symmetry directions, has been performed. The Rayleigh modes were observed over most of the reduced surface Brillouin zone; these results agree with previous measurements and theory. Two new modes at and near the zone boundary for the <110> and the <100> high symmetry directions are observed at 40 meV and 36 meV, respectively. A weak half order reconstruction is observed in diffraction scans in the <100> direction. A suggested mechanism for the latter is given. Refined bound state resonance information, giving the energy levels of the laterally averaged He+MgO(001) surface potential are included. @FootnoteText@ @footnote 1@ Supported in part (JGS) by DOE Grant No. DE-FG02-97ER45635.