Abstract
The adsorption and diffusion of CO molecules on a Pt(111) surface
have been studied using low-energy electron microscopy (LEEM). The
explicit relationship between LEEM image intensity and CO coverage
that is determined during adsorption is used to characterize nonequilibrium
CO coverage profiles that are subsequently prepared by laser-induced
thermal desorption. Real-time observations of the temporal evolution
of these profiles toward equilibrium uniform coverage distributions
are analyzed by predictive and inverse solutions of the diffusion
equation. These two methods determine consistently the detrimental
effect on diffusion of the laser-induced surface damage that is observed
directly with LEEM. The inverse method also provides independent
information on the coverage dependence of diffusion with high coverage
resolution.
Users
Please
log in to take part in the discussion (add own reviews or comments).