Water dissociation on Ru(001): An activated process

被引：197

作者：

Andersson, K

Nikitin, A

Pettersson, LGM

Nilsson, A

Ogasawara, H

机构：

[1] Stanford Synchrotron Radiat Lab, Menlo Pk, CA 94025 USA

[2] Stockholm Univ, FYSIKUM, Albanova Univ Ctr, S-10691 Stockholm, Sweden

来源：

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

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.93.196101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

It is shown using x-ray photoelectron spectroscopy that water is adsorbed either nondissociatively or partially dissociatively on Ru(001) under ultrahigh vacuum conditions. We found an activated dissociation process with a barrier slightly larger than that of desorption. A difference in dissociation barriers is found between H2O and D2O that explains the anomalous isotope effects in the thermal desorption. Previous theoretical and experimental disagreements can be rationalized based on electron or x-ray beam-induced dissociation of the water overlayer and an earlier underestimation of the dissociation barrier.

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页码：196101 / 1

页数：4

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