CO stretching vibrations on Pt(111) and Pt(110) studied by sum-frequency generation

被引：110

作者：

Klunker, C ^{[1
]}

Balden, M ^{[1
]}

Lehwald, S ^{[1
]}

Daum, W ^{[1
]}

机构：

[1] FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST GRENZFLACHENFORSCH & VAKUUMPHYS, D-52425 JULICH, GERMANY

来源：

SURFACE SCIENCE | 1996年 / 360卷 / 1-3期

关键词：

carbon monoxide; electron-energy loss spectroscopy; platinum; sum-frequency generation; vibrations of adsorbed molecules;

D O I：

10.1016/0039-6028(96)00638-3

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：

Optical sum-frequency generation (SFG) is used to characterize CO stretching vibrations on Pt(111) and Pt(110) surfaces, Different adsorption sites (terminal bridge and step sites) are identified in the SFG spectra of CO on Pt(111), in good quantitative agreement with previous infrared relation-absorption experiments on this system. For CO on Pt(110) we only observe CO molecules on terminal sites. The measured CO stretching vibration frequencies on Pt(110), both for low and high coverages, are at variance with the results of previous infrared studies. Our SFG results for CO on Pt(110) art confirmed by independent EELS measurements which, in addition, also reveal the frustrated rotational mode and the metal-CO vibration, The measured frequency of 2065 cm(-1) for low CO coverage on Pt(110)-(1x2) is consistent with a previously proposed empirical relation between the frequency of an isolated adsorbed CO molecule and the coordination number of the binding Pt surface atom.

引用

页码：104 / 111

页数：8

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