'Magic' island formation of CO coadsorbed with H on Ru(0001)

被引：20
作者：
Riedmüller, B
Papageorgopoulos, DC
Berenbak, B
van Santen, RA
Kleyn, AW
机构：
[1] Leiden Univ, Leiden Inst Chem Gorlaeus Labs, NL-2300 RA Leiden, Netherlands
[2] FOM, Inst Atom & Mol Phys, NL-1098 SJ Amsterdam, Netherlands
[3] Univ Liverpool, Surface Sci Res Ctr, Liverpool L69 3BX, Merseyside, England
[4] Free Univ Amsterdam, Fac Exact Sci, Dept Chem Phys, NL-1081 HV Amsterdam, Netherlands
[5] Eindhoven Univ Technol, Schuit Inst Catalysis, NL-5600 MB Eindhoven, Netherlands
来源：
SURFACE SCIENCE | 2002年 / 515卷 / 2-3期
关键词：
carbon monoxide; ruthenium; hydrogen atom; growth; clusters;
D O I：
10.1016/S0039-6028(02)01912-X
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The mutual interaction between carbon monoxide and hydrogen coadsorbed on Ru(0001) has been studied by thermal desorption spectroscopy and thermal He-atom scattering. At 250 K, the hydrogen of a fully hydrogenated Ru surface is displaced by CO. During displacement CO segregates into islands already at very low coverages. At a low exposure pressure (1.5 x 10(-9) mbar) small islands with a 'magic' size of seven molecules are formed, whilst higher exposure pressures (2 x 10(-8) mbar) lead to larger islands. This behavior is in contradiction with a mean field description of island growth introduced by Venables [Rep. Prog. Phys. 47 (1984) 399]. (C) 2002 Elsevier Science B.V. All rights reserved.
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页码：323 / 336
页数：14
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