Low-energy electron diffraction study of potassium adsorbed on single-crystal graphite and highly oriented pyrolytic graphite

被引:29
作者
Ferralis, N
Pussi, K
Finberg, SE
Smerdon, J
Lindroos, M
McGrath, R
Diehl, RD
机构
[1] Penn State Univ, Dept Phys, University Pk, PA 16802 USA
[2] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA
[3] Tampere Univ Technol, Inst Phys, FIN-33101 Tampere, Finland
[4] Bentley Coll, Dept Nat Sci, Waltham, MA 02452 USA
[5] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England
[6] Univ Liverpool, Surface Sci Res Ctr, Liverpool L69 3BX, Merseyside, England
基金
美国国家科学基金会; 英国工程与自然科学研究理事会;
关键词
D O I
10.1103/PhysRevB.70.245407
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Potassium adsorption on graphite has been a model system for the understanding of the interaction of alkali metals with surfaces. The geometries of the (2x2) structure of potassium on both single-crystal graphite (SCG) and highly oriented pyrolytic graphite (HOPG) were investigated for various preparation conditions for graphite temperatures between 55 and 140 K. In all cases, the geometry was found to consist of K atoms in the hollow sites on top of the surface. The K-graphite average perpendicular spacing is 2.79+/-0.03 Angstrom,corresponding to an average C-K distance of 3.13+/-0.03 Angstrom, and the spacing between graphite planes is consistent with the bulk spacing of 3.35 Angstrom. No evidence was observed for a sublayer of potassium. The results of dynamical LEED studies for the clean SCG and HOPG surfaces indicate that the surface structures of both are consistent with the truncated bulk structure of graphite.
引用
收藏
页码:1 / 6
页数:6
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