Phys. Rev. B 58, R7552–R7555 (1998)

Azimuthal dependence of classical over-barrier hopping diffusion of hydrogen on a vicinal Ni(111) surface

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E. Nabighian and X. D. Zhu^*
Department of Physics, University of California at Davis, One Shields Avenue, Davis, California 95616-8677

Received 26 May 1998; published in the issue dated 15 September 1998

Using an unusual arrangement of optical techniques, we studied the full azimuthal dependence of hydrogen diffusion on a 0.1°-miscut Ni(111) surface vs temperature. From such a dependence, we arrived at the conclusion that the extra energy barrier for a hydrogen adatom to cross a [110] step edge must be less than 60 meV or 1.5 kcal/mol.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.58.R7552

DOI:

10.1103/PhysRevB.58.R7552

PACS:

68.35.Fx, 81.10.Bk

^*Author to whom correspondence should be addressed. Electronic address: xdzhu@physics.ucdavis.edu

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Phys. Rev. B 58, R7552–R7555 (1998)

Azimuthal dependence of classical over-barrier hopping diffusion of hydrogen on a vicinal Ni(111) surface