A. S. Sanz, R. Martinez-Casado, S. Miret-Artes
The incoherent tunneling surface diffusion of light atoms is analyzed in terms of a Chudley-Elliot master equation constrained to nearest neighbors for moderate to high temperatures (above the crossover surface temperature). Recent helium spin-echo measurements for diffusing H and D atoms on a Pt(111) surface are thus examined within the framework of the so-called bounce technique. A good agreement is found between theory and experiment, with the substrate friction coefficients obtained being of the order of those reported in the literature for this kind of systems. Furthermore, following this model, an increase of the tunneling rate is predicted for decreasing surface coverages.
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http://arxiv.org/abs/1207.3199
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