AVS 45th International Symposium
    Surface Science Division Monday Sessions
       Session SS2-MoM

Paper SS2-MoM11
Ordering of Chemisorbed PF@sub 3@ on Cu(001)

Monday, November 2, 1998, 11:40 am, Room 309

Session: Molecular Adsorbates on Metals
Presenter: B.J. Hinch, Rutgers University
Authors: J. Braun, Rutgers University
L.V. Goncharova, Rutgers University
G.G. Bishop, Rutgers University
A.V. Ermakov, Rutgers University
D.-M. Smilgies, Rutgers University
B.J. Hinch, Rutgers University
Correspondent: Click to Email
PF@sub 3@ adsorbs molecularly on many transition metal surfaces with P bonded at 'on top' positions. On close packed Pt, Ni and Ru crystal faces, PF@sub 3@ has been reported to adsorb with a high density @sr@3 x @sr@3 structure. In these cases steric interactions are believed to be strong enough to prevent rotational motion of the molecules about an axis parallel to the surface normal. On Cu(001), between 140K and 200K, a saturated(4x2) structure with at least two 90° rotated domains has been observed with both helium atom scattering and LEED. We shall discuss the implications of free rotational motion of these molecules in the c(4x2) and a close-packed, uniaxially-compressed, near-hexagonal phase that is found at higher coverages and lower temperatures. Evidence for PF@sub 3@ decomposition on Cu at temperatures above 500K will also be presented.