CO2 chemisorption at Ca and CaO surfaces:: a study with MIES, UPS(HeI) and XPS

被引：71

作者：

Ochs, D ^{[1
]}

Braun, B ^{[1
]}

Maus-Friedrichs, W ^{[1
]}

Kempter, V ^{[1
]}

机构：

[1] Tech Univ Clausthal, Inst Phys, D-38678 Clausthal Zellerfeld, Germany

来源：

SURFACE SCIENCE | 1998年 / 417卷 / 2-3期

关键词：

calcium; calcium oxide; CO2; metastable impact electron spectroscopy (MIES); photoelectron spectroscopy (UPS(HeI)); scanning tunneling microscopy (STM);

D O I：

10.1016/S0039-6028(98)00721-3

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：

Metastable impact electron spectroscopy (MIES) in combination with UPS(HeI) and X-ray photoelectron spectroscopy was applied to study chemisorption of CO2 on Ca and CaO films at room temperature. Ca surfaces were prepared by evaporating Ca films (ca 20 Mt thickness) on a clean Si(111) surface; information on the topological structure of the Ga film was obtained with scanning tunneling microscopy (STM). CaO films were produced by exposing Ca films to O-2 or N2O. Ca surfaces exposed to CO2 become terminated by carbonate complexes (CO32-) while features typical for (Ca-O) bonds are detected underneath the surface. A closed carbonate layer forms also when a CaO film is exposed to CO2. The strong reactivity of the CaO surface against CO2 is in agreement with recent results of cluster calculations. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：406 / 414

页数：9

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