High resolution images of Mo2C(0001)-(√3 x √3)R30° structure by scanning tunneling microscopy

被引：28

作者：

Lo, RL

Fukui, K

Otani, S

Iwasawa, Y ^{[1
]}

机构：

[1] Univ Tokyo, Grad Sch Sci, Dept Chem, Bunkyo Ku, Tokyo 1130033, Japan

[2] Natl Inst Res Inorgan Mat, Tsukuba, Ibaraki 3050044, Japan

来源：

SURFACE SCIENCE | 1999年 / 440卷 / 03期

关键词：

low index single crystal surfaces; metallic surfaces; scanning tunneling microscopy; surface relaxation and reconstruction; surface structure; morphology; roughness; and topography;

D O I：

10.1016/S0039-6028(99)00851-1

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：

A (root 3x root 3)R30 degrees C-terminated structure on Mo2C(0001) was observed by scanning tunneling microscopy. The structure was observed as a honeycomb structure with dark depressions corresponding to C atoms which make up the (root 3 x root 3)R30 degrees lattice. High resolution imaging was possible at low tunneling resistance less than 1 M Ohm. Each C atom appears as a shallow sombrero protrusion predicted by theoretical calculations of C atoms on a metal substrates. It is concluded that the C atoms occupied threefold hollow sites of the (1 x 1) Mo layer of the substrate and a model for the (root 3 x root 3)R30 degrees structure is proposed. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：L857 / L862

页数：6

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