Interaction of oxygen with lead-precovered nickel(100)

被引：10

作者：

Argile, C ^{[1
]}

机构：

[1] Ecole Normale Super Chim Paris, Lab Physicochim Surfaces, CNRS, URA 425, F-75005 Paris, France

来源：

SURFACE SCIENCE | 1998年 / 409卷 / 02期

关键词：

Auger electron spectroscopy; lead; low index single crystal surface; metallic films; nickel; oxidation; oxygen;

D O I：

10.1016/S0039-6028(98)00218-0

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：

The interaction of oxygen with lead-precovered Ni(100) has been investigated by Auger electron spectroscopy (AES). The oxygen chemisorption capacity decays linearly with lead coverage and is completely suppressed above 0.5 lead atom per nickel atom; lead acts as an inert site blocker for the chemisorption stage. Preadsorbed lead slows down the oxidation kinetics, but does nor prevent substrate oxidation; nickel oxidation occurs in the bare areas as well as under the lead deposit. For lead, the oxidation mechanism is different according to whether the atoms are in a two-dimensional configuration (submonolayer range) or in a three-dimensional one (crystallites): for crystallites, oxidation occurs from direct impingement of oxygen molecules; for a submonolayer deposit, the oxidation results from a charge transfer between the lead atoms and the underlying nickel oxide. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：265 / 271

页数：7

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