AVS 45th International Symposium
    Surface Science Division Monday Sessions
       Session SS-MoP

Paper SS-MoP9
Adsorbate Azimuthal Orientation from Reflectance Anisotropy Spectroscopy

Monday, November 2, 1998, 5:30 pm, Room Hall A

Session: Surface Science Division Poster Session
Presenter: B.G. Frederick, University of Maine
Authors: B.G. Frederick, University of Maine
J.R. Power, University of Liverpool, United Kingdom
R.J. Cole, University of Liverpool, United Kingdom
C.C. Perry, University of Liverpool, United Kingdom
Q. Chen, University of Liverpool, United Kingdom
S. Haq, University of Liverpool, United Kingdom
T. Bertrams, University of Liverpool, United Kingdom
N.V. Richardson, University of St. Andrews, Scotland, U.K.
P. Weightman, University of Liverpool, United Kingdom
Correspondent: Click to Email
We have determined the azimuthal orientation of an adsorbate on a metal surface from an intramolecular-transition-derived feature in reflectance anisotropy spectroscopy (RAS). Adsorption of 9-anthracene carboxylic acid onto p(2x1)O/Cu(110) led to an ordered structure with a strong (2%), derivative-like feature at 4.5 eV. Fresnel theory predicts the measured intensity, functional behavior, and sense of the RAS signal for the molecule aligned along [110]. IR measurements confirm that the molecular plane is perpendicular to the surface and STM measurements support the azimuthal orientation.