J. Braun et al., A HE-ATOM SCATTERING STUDY OF THE FRUSTRATED TRANSLATIONAL MODE OF COCHEMISORBED ON DEFECTS ON COPPER SURFACES, The Journal of chemical physics, 105(8), 1996, pp. 3258-3263
The energies of the frustrated translational vibrations parallel to th
e surface (T-mode) of isolated CO molecules adsorbed on various flat,
regularly stepped and defective surfaces of copper have been measured
using high resolution He-atom scattering. Whereas on the Cu(111) and C
u(001) surfaces CO has a T-mode energy of about 4.0 meV, at the steps
of the Cu(211) and Cu(511) surfaces it is reduced to 3.0 meV. The same
energy was observed for scattering parallel and perpendicular to the
step edge directions. At defects, which were created by sputtering und
er different conditions, two additional T-mode energies of 3.2 meV and
2.5 meV were observed and are attributed to CO molecules adsorbed at
step edges and at ''isolated'' defects, respectively. (C) 1995 America
n Institute of Physics.