Structural analyses of the pure and cesiated Ru(0001)-(2x2)-3O phase

被引：41

作者：

Kim, YD ^{[1
]}

Wendt, S ^{[1
]}

Schwegmann, S ^{[1
]}

Over, H ^{[1
]}

Ertl, G ^{[1
]}

机构：

[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

来源：

SURFACE SCIENCE | 1998年 / 418卷 / 01期

关键词：

alkali metals; chemisorption; compound formation; low energy electron diffraction (LEED); low index single crystal surfaces; oxygen; ruthenium; surface chemical reaction; surface structure; morphology; roughness and topography;

D O I：

10.1016/S0039-6028(98)00722-5

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 structures of the (2 x 2)-3O and the (2 x 2)-3O-Cs overlayers on the Ru(0001) surface were analyzed by LEED. The Ru(0001)-(2 x 2)-3O phase is characterized by a (2 x 2) vacancy network in which CO molecules are not able to adsorb whereas Ca atoms are. The averaged topmost Ru layer distance (2.21 Angstrom) is slightly expanded with respect to the bulk value, which is consistent with the observed trend that the topmost Ru layer distance increases with O-coverage. Coadsorbing Cs atoms reside in the vacancies exposed by the (2 x 2)-3O overlayer, whereby the local structural parameters remain essentially unaltered. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：267 / 272

页数：6

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