OXYGEN-ADSORPTION ON AG(111)

被引：46

作者：

DEMONGEOT, FB

VALBUSA, U

ROCCA, M

机构：

[1] CNR,CTR FIS SUPERFICI & BASSE TEMP,I-16146 GENOA,ITALY

[2] UNIV GENOA,DIPARTIMENTO FIS,INFM,I-16146 GENOA,ITALY

来源：

SURFACE SCIENCE | 1995年 / 339卷 / 03期

关键词：

ADATOMS; CHEMISORPTION; ELECTRON ENERGY LOSS SPECTROSCOPY; LOW INDEX SINGLE CRYSTAL SURFACES; OXYGEN; SILVER; STICKING;

D O I：

10.1016/0039-6028(95)00594-3

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：

We have investigated the interaction of oxygen with Ag(111) by using a supersonic molecular beam in the impact energy range 93-800 meV. At 105 K, contrary to the results of Carley et al. [Surf. Sci. 238 (1990) L467], we find no evidence for O-2 adsorption even after very high O-2 exposures (similar to 25000 L) indicating that for a clean surface the sticking probability S is lower than 6 x 10(-7) far the whole impact energy range. At room temperature dissociative oxygen adsorption occurs at E(i) = 0.80 eV, with S approximate to 9 x 10(-7). The data show however evidence that the adsorption process is mediated also in this case by adsorbed OH so that S is even smaller for the clean surface.

引用

页码：291 / 296

页数：6

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