On the diffusion of "hot" adsorbates: A non-monotonic distribution of single particle diffusion lengths for CO/Cu(111)
L. Bartels, M. Wolf, G. Meyer and K.H. Rieder
Chem. Phys. Lett. 291, (1998) 573.
The diffusion of highly excited („hot“) CO molecules on Cu(111) produced by electron attachment in the course of vertical manipulation within an scanning tunneling microscope (STM) setup is studied at low temperatures. The majority of the excited molecules exhibit a diffusion length of one adsite only, whereas of the remaining molecules more were found at the third nearest neighbor than at the second. This indicates that ballistic (unscattered) movement plays an import role in the diffusion process. A Monte Carlo simulation allows to estimate the probability of ballistic movement to be at least 15% per transgressed adsite.
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