Experimental evidence for a partially dissociated water bilayer on Ru{0001}

被引：123

作者：

Weissenrieder, J ^{[1
]}

Mikkelsen, A

Andersen, JN

Feibelman, PJ

Held, G

机构：

[1] Lund Univ, Max Lab, S-22100 Lund, Sweden

[2] Lund Univ, Inst Phys, S-22100 Lund, Sweden

[3] Sandia Natl Labs, Albuquerque, NM 87185 USA

[4] Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 19期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.93.196102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Core-level photoelectron spectra, in excellent agreement with ab initio calculations, confirm that the stable wetting layer of water on Ru{0001} contains O-H and H2O in roughly 3:5 proportion, for OHx coverages between 0.25 and 0.7 ML, and T<170 K. Proton disorder explains why the wetting structure looks to low energy electron diffraction (LEED) to be an ordered p(root3xroot3)R30degrees adlayer, even though approximate to3/8 of its molecules are dissociated. Complete dissociation to atomic oxygen starts near 190 K. Low photon flux in the synchrotron experiments ensured that the diagnosis of the nature of the wetting structure quantified by LEED is free of beam-induced damage.

引用

页码：196102 / 1

页数：4

共 26 条

[1] Low-temperature partial dissociation of water on Cu(110) [J].