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Photoelectron diffraction observations of adsorbates on nickel surfaces
Surface Seiertce 89 (1979) 51 © North-Holland Publishing Company
PHOTOELECTRON DIFFRACTION OBSERVATIONS OF ADSORBATES ON NICKEL SURFACES D. NORMAN Science Research Council, Daresbury Laboratory, Daresbury, Warrington WA4 4AD, UK
H.H. FARRELL, M.M. TRAUM and N.V. SMITH Bell Laboratories, Murray Hill, New Jer~y 07974, USA
D.P. WOODRUFF, B.W, HOLLAND and M.S. WOOLFSON Department of Physics, University of Warwick, Coventry CV4 7AL, UK
and C.W. SEABURY, R.J. PURTELL, R.P. MERRILL and T.N. RHODIN Cornell University, Ithaca, New York 14853, USA
Received 6 March 1979; manuscript received in final form 10 April 1979
Measurement of the anisotropy of photoemission from core levels in adsorbed species has been proposed as a surface structural technique, and has been named photoelectron diffraction (PhD). We report measurements using synchrotron radiation of the azimuthal dependence of Se 3d and Te 4d emission for these atoms adsorbed in the c(2 × 2) configuration on Ni {t301}. These were taken as part of a larger programme to survey the phenomenology of PhD. Substantial azimuthal anisotropies are observed with maximum/minimum intensity ratios of ~1.5 being found for a variety of experimental conditions. The azimuthal patterns are species dependent and vary quite strongly with both photoelectron energy and polar angle of emission. We corapare our earlier results for the 2p emission from Na adsorbed on Ni {001} with theoretical calculations based on LEED-type formalisms, and the prospects of using PhD four the determination of adsorbate sites and d-spacings are discussed.
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PHOTOELECTRON DIFFRACTION OBSERVATIONS OF ADSORBATES ON NICKEL SURFACES D. NORMAN Science Research Council, Daresbury Laboratory, Daresbury, Warrington WA4 4AD, UK
H.H. FARRELL, M.M. TRAUM and N.V. SMITH Bell Laboratories, Murray Hill, New Jer~y 07974, USA
D.P. WOODRUFF, B.W, HOLLAND and M.S. WOOLFSON Department of Physics, University of Warwick, Coventry CV4 7AL, UK
and C.W. SEABURY, R.J. PURTELL, R.P. MERRILL and T.N. RHODIN Cornell University, Ithaca, New York 14853, USA
Received 6 March 1979; manuscript received in final form 10 April 1979
Measurement of the anisotropy of photoemission from core levels in adsorbed species has been proposed as a surface structural technique, and has been named photoelectron diffraction (PhD). We report measurements using synchrotron radiation of the azimuthal dependence of Se 3d and Te 4d emission for these atoms adsorbed in the c(2 × 2) configuration on Ni {t301}. These were taken as part of a larger programme to survey the phenomenology of PhD. Substantial azimuthal anisotropies are observed with maximum/minimum intensity ratios of ~1.5 being found for a variety of experimental conditions. The azimuthal patterns are species dependent and vary quite strongly with both photoelectron energy and polar angle of emission. We corapare our earlier results for the 2p emission from Na adsorbed on Ni {001} with theoretical calculations based on LEED-type formalisms, and the prospects of using PhD four the determination of adsorbate sites and d-spacings are discussed.
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