Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5425128 | Surface Science | 2007 | 8 Pages |
Abstract
The adsorption of K atoms on Cu(0Â 0Â 1) has been studied by low-energy electron diffraction (LEED) at room temperature (RT) and 130Â K. At RT, a (3Â ÃÂ 2)-p2mg LEED pattern with single-domain was observed at coverage of 0.33, whereas the orthogonal two-domain was found at 130Â K. At 130Â K, a c(4Â ÃÂ 2) pattern with orthogonal two-domain was observed at coverage 0.25. Both the (3Â ÃÂ 2)-p2mg and c(4Â ÃÂ 2) structures have been determined by a tensor LEED analysis. It is demonstrated that K atoms are adsorbed on surface fourfold hollow sites in the c(4Â ÃÂ 2), while in the (3Â ÃÂ 2) structure two K atoms in the unit cell are located at an asymmetric site with a glide-reflection-symmetry. The asymmetric site is at near the midpoint between the exact hollow site and bridge-site but slightly close to the hollow site. A rumpling of 0.07Â Ã
in the first Cu layer was confirmed, which might stabilize K atoms at the asymmetric site. Surface structures appearing in a coverage range 0.25-0.33 are discussed in terms of the occupation of the asymmetric site with increase of coverage.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Ming-Shu Chen, Seigi Mizuno, Hiroshi Tochihara,