Coverage and nearest-neighbor dependence of adsorbate diffusion.
We present data on the coverage and nearest-neighbor dependences of the diffusion of CO on Cu(111) by time-lapsed scanning tunneling microscope (STM) imaging. Most notable is a maximum in diffusivity of CO at a local coverage of one molecule per 20 substrate atoms and a repulsion between CO molecules upon approach closer than three adsites, which in combination with a less pronounced increase in potential energy at the diffusion transition state, leads to rapid diffusion of CO molecules around one another. We propose a new method of evaluating STM-based diffusion data that provides all parameters necessary for the modeling of the dynamics of an adsorbate population.
Wong
Kin L
KL
Pierce Hall, University of California-Riverside, Riverside, CA 92521, USA.
Rao
Bommisetty V
BV
Pawin
Greg
G
Ulin-Avila
Erick
E
Bartels
Ludwig
L