Photoelectron-Diffraction Studies of Nb(001)

W.-S. Lo, T.-S. Chien, B.-S. Fang, C. M. Wei and W. N. Mei
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W.-S. Lo: Research Division, Synchrotron Radiation Research Center, Hsin-Chu, Taiwan 300, ROC
T.-S. Chien: Research Division, Synchrotron Radiation Research Center, Hsin-Chu, Taiwan 300, ROC
B.-S. Fang: Research Division, Synchrotron Radiation Research Center, Hsin-Chu, Taiwan 300, ROC;
C. M. Wei: Institute of Physics, Academia Sinica, Nankang, Taiwan 11529, ROC
W. N. Mei: Department of Physics, University of Nebraska at Omaha, Nebraska 68182, USA

Surface Review and Letters (SRL), 1998, vol. 05, issue 05, 1035-1041

Abstract: Photoelectron-diffration studies of Nb(001) have been performed to determine the first-interlayer contraction using Mg Kα radiation (hν=1253.6eV) as an excitation source. Photoemission intensities of the3d5/2core level were measured as a function of the polar angle along several azimuths on the single-crystal surface. The 202.3-eV (205.O-eV) binding energy for the3d5/2(3d3/2)core level was well resolved in the photoemission spectra, where the peak intensity could be easily evaluated by curve-fitting processes. Large oscillations of the3d5/2intensity as a function of the polar angle due to forward-focusing were observed. Based on multiple-scattering calculations for several first-interlayer spacings ranging from the bulk value to 16% contraction, the best agreement with experiment was obtained for a(13±5)%contraction of the first-interlayer spacing.

Keywords: 61.14.Rq; 68.35.Bs (search for similar items in EconPapers)
Date: 1998
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DOI: 10.1142/S0218625X98001407

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