Abstract
Previous LEED structural studies of benzene chemisorption on transition
metal surfaces have relied on the presence of coadsorbed carbon monoxide
to induce ordering in the overlayer. To investigate the effect of
CO on the benzene structure, the disordered pure benzene layer chemisorbed
on Pt(111) is studied by diffuse LEED intensity analysis. The diffuse
LEED intensity has been measured using a digital LEED apparatus and
analysed using an extension of the beam set neglect method. The benzene
is found to chemisorb in a two-fold bridge site rotated by 30� with
respect to the site found for the ordered phase formed in the presence
of coadsorbed CO. In addition, the benzene ring is found to be distorted.
Parallel distortions are subject to large error bars, but perpendicular
spacings have been more accurately determined. These include a buckling
distortion not previously seen for benzene chemisorption on transition
metal surfaces.
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