کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5425128 | 1395848 | 2007 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Asymmetric adsorption-site of potassium atoms in the (3Â ÃÂ 2)-p2mg structure formed on Cu(0Â 0Â 1)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Asymmetric adsorption-site of potassium atoms in the (3Â ÃÂ 2)-p2mg structure formed on Cu(0Â 0Â 1) Asymmetric adsorption-site of potassium atoms in the (3Â ÃÂ 2)-p2mg structure formed on Cu(0Â 0Â 1)](/preview/png/5425128.png)
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 601, Issue 22, 15 November 2007, Pages 5162-5169
Journal: Surface Science - Volume 601, Issue 22, 15 November 2007, Pages 5162-5169
نویسندگان
Ming-Shu Chen, Seigi Mizuno, Hiroshi Tochihara,