Diffusion on Surfaces Affected by Lateral Interactions
We have investigated the effect of lateral interactions on the diffusion of adsorbates on surfaces using laser diffraction of second harmonic light. Computer simulations of diffusion for a number of interaction models predict a wide range of behavior for the decay of the diffraction signals during diffusion. Experimental results for the diffusion of potassium on Re(001) show that the activation energy for diffusion reaches a minimum at a coverage of approximately 0.7 ML and then increases. The experimentally determined activation energies and diffusion coefficients as a function of potassium coverage are described well by a depolarization model derived from work function measurements.
KeywordsAttractive Interaction Repulsive Interaction Lateral Interaction Second Harmonic Diffraction Signal
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