LINEAR DICHROISM IN X-RAY-ABSORPTION SPECTROSCOPY OF STRONGLY CHEMISORBED PLANAR MOLECULES - ROLE OF ADSORPTION INDUCED REHYBRIDISATIONS

被引：73

作者：

MAINKA, C ^{[1
]}

BAGUS, PS ^{[1
]}

SCHERTEL, A ^{[1
]}

STRUNSKUS, T ^{[1
]}

GRUNZE, M ^{[1
]}

WOLL, C ^{[1
]}

机构：

[1] UNIV HEIDELBERG, D-69120 HEIDELBERG, GERMANY

来源：

SURFACE SCIENCE | 1995年 / 341卷 / 03期

关键词：

BENZENE; CHEMISORPTION; NEAR EDGE EXTENDED X-RAY ABSORPTION FINE STRUCTURE (NEXAFS); PLATINUM; PMDA;

D O I：

10.1016/0039-6028(95)00795-4

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：

Dipole selection rules require the pi*-resonances, which dominate X-ray absorption spectra for planar aromatic molecules, to have zero intensity for X-ray photons linearly polarized in the molecular plane. For molecules adsorbed in a flat geometry on metal surfaces, however, very often considerable intensities are observed for s-polarized light. We will present experimental and theoretical evidence that for two molecules, benzene and pyromellitic dianhydride (PMDA) adsorbed on Pt(111), this anomalously weak linear dichroism is not due to molecular disorder as assumed previously but arises from molecular rehybridisation caused by out-of-plane molecular distortions.

引用

页码：L1055 / L1060

页数：6