Substitutional adsorption geometry for Pb(1 1 1)-(√3 × √3)R30°-K |
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| Authors: | FM Pan N Ferralis |
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| Institution: | a Department of Physics and Materials Research Institute, Pennsylvania State University, 104 Davey Laboratory, University Park, PA 16802, USA
b Department of Physics, Ohio Northern University, Ada, OH 45810, USA |
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| Abstract: | Intermixed structures for alkalis (larger than Li) on close-packed substrates have previously been observed only on Al(1 1 1). This study shows that K forms an ordered intermixed structure on Pb(1 1 1). The structures of clean Pb(1 1 1) and Pb(1 1 1)-(√3 × √3)R30°-K were studied using dynamical low-energy electron diffraction (LEED). The clean Pb(1 1 1) surface at 47 K was found to be a relaxed version of the bulk structure, in agreement with an earlier study of the same surface Y.S. Li, F. Jona, P.M. Marcus, Phys. Rev. B 43 (1991) 6337]. At room temperature, adsorption of K on this surface results in a (√3 × √3)R30° structure, which was shown using dynamical LEED to consist of K atoms substituted in surface vacancies. The K-Pb bond length was found to be 3.62 ± 0.3 Å, with no significant change to the Pb interlayer spacings. |
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| Keywords: | Low energy electron diffraction (LEED) Surface structure Adsorption |
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