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
收藏
页码：291 / 296
页数：6
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