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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 ,
B. E. Larson ,
M. El-Batanouny ,
C. R. Willis  and
K. M. Martini
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 C3v symmetry at (1 × 1) saturation coverage (140°K) and its transformation to C6v 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
Information
MRS Online Proceedings Library (OPL) , Volume 208: Symposium J – Advances in Surface and Thin Film Diffraction , 1990 , 63
Copyright
Copyright © Materials Research Society 1991

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References

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