We studied the surface diffusion of hydrogen on Ni(100) by linearly diffracting a probe laser beam from a monolayer grating of adsorbed hydrogen. In the temperature range from 110 to 161 K the Arrhenius plot shows a significant leveling off of the diffusion coefficient D(T) at around 144 K. Such a deviation from the behavior of thermally activated diffusion suggests the onset of quantum tunneling diffusion.
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Zhu et al. (1992) studied this question.
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