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The barrier and prefactor for self-diffusion of Pd on Pd(111) are derived from scanning tunnelling investigations of the homoepitaxial growth of Pd/Pd(111). The barrier for diffusion is found to be 350 meV. This is the highest value observed so far for self-diffusion on a fcc(111) metal surface. Such exceptional behaviour has recently been predicted, as Pd(111) - unlike other fcc(111) transition metals - does not support an occupied free-electron like surface state. An exceptionally high prefactor of 6 X 10(x16)s-1 is observed, indicating a large entropic contribution to diffusion in accordance with the Meyer-Neldel compensation law.

Additional information

Authors: STELTENPOHL A, Max-Planck-Institut f³r Plasmaphysik, Surface Science Division, EURATOM-Association, Garching bei M³nchen (DE);MEMMEL N, Institut f³r Physikalische Chemie, Universitõt Innsbruck, Innsbruck (AT)
Bibliographic Reference: Article: Surface Science 454-456 (2000) pp. 558-561
Availability: Surface Science (Journal)
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