Abstract
Diffusion of hydrogen in metals has been a subject of great interest, both experimentally and theoretically. Diffusion coefficients exhibit many peculiar features, in their magnitude, their dependence on isotope mass and temperature, and these features strongly suggest that some quantum-mechanical processes are at work. In fact, a general understanding of the diffusion mechanism has been attained rather recently. According to our present understanding, the motion of hydrogen atoms between adjacent sites is governed at all temperatures by quantum-mechanical tunneling (quantum diffusion) instead of thermally activated over-barrier jumps (classical diffusion).
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