AVS 50th International Symposium
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP8
Surface Lattice Dynamics of KCl(001) by Helium Atom Scattering

Tuesday, November 4, 2003, 5:30 pm, Room Hall A-C

Session: Poster Session
Presenter: R. Fatema, Florida State University
Authors: R. Fatema, Florida State University
F.A. Flaherty, Valdosta State University
S.A. Safron, Florida State University
J.G. Skofronick, Florida State University
D.H. Van Winkle, Florida State University
Correspondent: Click to Email
High-resolution helium atom scattering (HAS) has been employed to investigate the surface lattice dynamics of the KCl(001) surface, produced by cleaving a single crystal sample in ultra high vacuum (UHV). Several branches of the surface phonon dispersion have been mapped out in the <100> and <110> high symmetry directions, across the surface Brillouin zone (SBZ). These include the low-energy Rayleigh wave, a "crossing mode" which increases in energy from the SBZ boundary to the zone center, and optical modes which appear dispersionless across the SBZ. These results are compared with "shell model" calculations and with experimental results, which were reported previously. The implications of these results for the use of KCl(001) as a substrate for films of soft materials is also discussed.