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The Effect of Adsorbeb Oxygen Ions on the Inelastic Scattering of Photo-Electrons at the Metal-Vacuum Interface

Published online by Cambridge University Press:  25 February 2011

W. Pong ,
D. Brandt ,
Z. X. He  and
W. Imaino
Z. X. He
Affiliation:
Dept. of Physics and Astronomy, Univ. of Hawaii, HI 96822
W. Imaino
Affiliation:
IBM Research Laboratory, San Jose, CA 95193
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Abstract

Measurements of uv photoemission from evaporated aluminum films were made at photon energies 7.7–11 eV as a function of time after film deposition. Evidence of the initial stage of chemisorption of oxygen can be seen in the uv photoelectron spectra. The spectra taken immediately after film deposition showed a smooth energy distribution characteristic of clean aluminum. Structure in the spectra was found to appear at approximately 60 minutes after deposition at 10−9 Torr. Three noticeable features were observed at 1.0, 1.3, and 2.5 eV above the vacuum level. They appeared stationary with increasing photon energy. The structure can be attributed to inelastic scattering of photoelectrons into resonant states associated with oxygen ions on the metal surface. The energy levels of the calculated resonant states of a helium-like system are compared with the energy of the observed structure. The agreement suggests that there are adsorbed 0− ions to which photoelectrons can be scattered at the metal-vacuum interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 41: Symposium K – Advanced Photon and Particle Techniques for the Characterization of Defects in Solids , 1984 , 149
Copyright
Copyright © Materials Research Society 1985

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