HREELS study of O-2 molecular chemisorption on Ag(001)

被引：35

作者：

Vattuone, L ^{[1
]}

Gambardella, P ^{[1
]}

Valbusa, U ^{[1
]}

Rocca, M ^{[1
]}

机构：

[1] INFM,DIPARTIMENTO FIS,I-16146 GENOA,ITALY

来源：

SURFACE SCIENCE | 1997年 / 377卷 / 1-3期

关键词：

chemisorption; electron energy loss spectroscopy; low index single crystal surfaces; oxygen; silver; vibrations of adsorbed molecules; INITIAL STICKING COEFFICIENT; ADSORPTION; OXYGEN; AG(110); O2; AG(100); EELS;

D O I：

10.1016/S0039-6028(96)01471-9

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：

O-2 adsorption on Ag(001) at 100 K has been investigated by HREELS. Contrary to previous reports we could resolve 4 oxygen related peaks, 3 of which are due to the internal stretching vibration as confirmed by isotope labelling. The lowest frequency mode at 63 meV is assigned to molecular oxygen chemisorbed at defect sites. The further two features are very close to each other in frequency, at 79 and 84 meV. We assign them to molecules chemisorbed in a peroxidic state in two different adsorption sites. Initially both sites are filled simultaneously while at higher coverage adsorption in the higher frequency site is favoured.

引用

页码：671 / 675

页数：5

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