SITE-SPECIFIC AND STATE-SELECTIVE PHOTOFRAGMENTATION OF MOLECULAR-OXYGEN ON SI(111)-(7X7)

被引：55

作者：

DUJARDIN, G ^{[1
]}

COMTET, G ^{[1
]}

HELLNER, L ^{[1
]}

HIRAYAMA, T ^{[1
]}

ROSE, M ^{[1
]}

PHILIPPE, L ^{[1
]}

BESNARDRAMAGE, MJ ^{[1
]}

机构：

[1] UNIV PARIS 11, CNRS, PHOTOPHYS MOLEC LAB, F-91405 ORSAY, FRANCE

来源：

PHYSICAL REVIEW LETTERS | 1994年 / 73卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.73.1727

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Molecular oxygen chemisorbed at room temperature on Si(111)-(7 X 7) exhibits a molecular adsorption site which is unexpectedly long lived. Photofragmentation from this specific O-2 adsorption site is studied by correlating the time decay of the corresponding molecular surface state observed in photoemission with the time decay of O+ desorbed photofragments. Photofragmentation occurs via direct nonresonant O2/Si(2 sigma g(-1)) and resonant O-2/Si (2p --> 3 sigma(u) electronic transitions. State selectivity of the photofragmentation is demonstrated by translational energy measurements of the O+ desorbed fragments.

引用

页码：1727 / 1730

页数：4

共 21 条

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