Abstract
The capability of a He-scattering experiment to detect the migration
of adsorbed molecules on monocrystal surfaces is demonstrated for
the first time. CO migration and island formation can be investigated
at very low coverages because of the very large cross section for
He scattering of CO adsorbed on Pt(111). The activation energy for
CO migration on Pt(111) is found to be 7 kcal/mole. No island formation
at low CO coverages on a defect-free Pt(111) surface was detected
in the temperature range 120-400 K.
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