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 level off of the diffusion coefficient D(T) at around 144 K. Such a deviation from the behavior of a thermally activated diffusion suggests the onset of quantum tunneling diffusion.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physical Review Letters|
|State||Published - 1992|
ASJC Scopus subject areas
- Physics and Astronomy(all)