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	Asymmetric adsorption-site of potassium atoms in the (3 x 2)-p2mg structure formed on Cu(001)
	Chen, MS ; Mizuno, S ; Tochihara, H ; Chen MS(陈明树)
	2007
关键词	surface structure morphology roughness and topology Potassium Cu(001)
英文摘要	The adsorption of K atoms on Cu(001) has been studied by low-energy electron diffraction (LEED) at room temperature (RT) and 130 K. At RT, a (3 x 2)-p2mg LEED pattern with single-domain was observed at coverage of 0.33, whereas the orthogonal two-domain was found at 130 K. At 130 K, a c(4 x 2) pattern with orthogonal two-domain was observed at coverage 0.25. Both the (3 x 2)-p2mg and c(4 x 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(4 x 2), while in the (3 x 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 0.07 angstrom 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. (C) 2007 Published by Elsevier B.V.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/64130]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Chen, MS,Mizuno, S,Tochihara, H,et al. Asymmetric adsorption-site of potassium atoms in the (3 x 2)-p2mg structure formed on Cu(001)[J],2007.
APA	Chen, MS,Mizuno, S,Tochihara, H,&陈明树.(2007).Asymmetric adsorption-site of potassium atoms in the (3 x 2)-p2mg structure formed on Cu(001)..
MLA	Chen, MS,et al."Asymmetric adsorption-site of potassium atoms in the (3 x 2)-p2mg structure formed on Cu(001)".(2007).

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