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Evidence of Quantum Motion of Hydrogen on Pd(111) in He-Diffraction data

Published online by Cambridge University Press:  22 February 2011

C-H. Hsu
Affiliation:
Department of Physics, Boston University, Boston, MA 02215
B. E. Larson
Affiliation:
Department of Physics, Boston University, Boston, MA 02215
M. El-Batanouny
Affiliation:
Department of Physics, Boston University, Boston, MA 02215
C. R. Willis
Affiliation:
Department of Physics, Boston University, Boston, MA 02215
K. M. Martini
Affiliation:
Department of Physics and Astronomy, University of Massachusetts, Amherst, MA 01003
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Abstract

We present elastic He-beam scattering data of the Pd(111)/H system. Diffraction intensities were measured as a function of surface temperature in the range 140°K–320°K. Two remarkable features are observed : the first is the presence of C 3 v symmetry at (1 × 1) saturation coverage (140°K) and its transformation to C 6 v symmetry at lower coverages (270°K). The second feature is the anomalous attenuation of the specular He beam accompanying this transformation. Taken together these features provide strong evidence of a fundamental change in the surface charge density corrugation. A classical interpretation of the motion of hydrogen either fails to reproduce the measured attenuation or leads to contradictory and unphysical conclusions regarding the H-metal bond length or surface equilibrium. An alternative quantum mechanical interpretation is developed and is shown to provide consistent and satisfactory explanation of the measurements.

Type
Research Article
Copyright
Copyright © Materials Research Society 1991

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Evidence of Quantum Motion of Hydrogen on Pd(111) in He-Diffraction data
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