Abstract
The diffusion parameters of barium on W(011) are shown to correlate with phase transitions in the adlayer. A suprisingly strong difference is found both in absolute values and in the coverage dependence of the diffusion parameters for barium on the (011) plane of W and Mo. A considerably lower mobility of barium on molybdenum is attributed to a larger contribution of covalent bonding on this substrate. It is concluded that the electron structure, together with the atomic structure of a surface, plays an important role in surface diffusion.
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