THE SURFACE STRUCTURES OFPd(100)-(1×1)ANDc(2×2)-K

J. Burchhardt, E. Lundgren, M.M. Nielsen, J.N. Andersen and D.L. Adams
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J. Burchhardt: Institute of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
E. Lundgren: Institute of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
M.M. Nielsen: Institute of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
J.N. Andersen: Institute of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
D.L. Adams: Institute of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark

Surface Review and Letters (SRL), 1996, vol. 03, issue 03, 1339-1343

Abstract: The surface structure of thePd(100)-c(2×2)-K phase formed by adsorption of K at room temperature has been determined by quantitative analysis of low-energy electron-diffraction (LEED) intensity-energy measurements. K atoms occupy four-fold hollow sites on a slightly perturbed substrate. The vertical distance between the K layer and the first Pd layer is determined to be2.13±0.06 Å, which corresponds to an effective hard-sphere radius of 1.83 Å for the adsorbed K atoms. The second Pd layer is rumpled with a splitting of 0.04 Å between two bilayers. An analysis of LEED intensities measured for the clean Pd(100) surface confirms previous reports of an expansion of the first interlayer spacing. Adsorption of K in thec(2×2)structure results in a reduction of this expansion from 5% to 1%.

Date: 1996
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DOI: 10.1142/S0218625X96002333

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