On the mechanism limiting CO diffusion perpendicular to steps on
Pt(111)
Surface Science, 425 (1):
131 - 137 (1999)DOI: DOI: 10.1016/S0039-6028(99)00201-0
Abstract
From the surface diffusion data perpendicular to steps, we deduced
that the Schwoebel barrier for CO molecules on Pt(111) is very small
and could even be negative with the help of the known additional
trapping energy at the step edges from independent measurements.
This result indicates that the slow down of diffusion perpendicular
to steps is likely due to the trapping well at the step edges.