Growth and alloy formation studied by photoelectron spectroscopy and STM

被引：25

作者：

Ramstad, A ^{[1
]}

Strisland, F ^{[1
]}

Raaen, S ^{[1
]}

Worren, T ^{[1
]}

Borg, A ^{[1
]}

Berg, C ^{[1
]}

机构：

[1] Norwegian Univ Sci & Technol, Dept Phys, NTNU, N-7034 Trondheim, Norway

来源：

SURFACE SCIENCE | 1999年 / 425卷 / 01期

关键词：

growth; low-index single crystal surfaces; metallic films; platinum; rhenium; scanning tunneling microscopy; synchrotron radiation photoelectron spectroscopy;

D O I：

10.1016/S0039-6028(99)00185-5

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：

We have grown epitaxial submonolayers of Re on a Pt(lll) surface. This system was studied by high-resolution photoelectron spectroscopy and scanning tunneling microscopy (STM). Re was found to grow, at room temperature, as single-layer islands consisting of similar to 100 atoms. Core-level spectroscopy showed that these islands contain two different species of Re. We interpret these as Re in the centre and on the edges of the islands, where Pt and Re may be intermixed at the edges. Annealing of the Re covered crystal to 1000 K produces a surface alloy with a high degree of local order and a thickness of approximately three layers. The structure of the alloy depends on the Re coverage prior to annealing. Valence band spectra show a strong depletion of Pt 5d states near the Fermi energy when Re is adsorbed, possibly caused by a Pt d-->sp rehybridization. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：57 / 67

页数：11

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