THE LOCAL ADSORPTION STRUCTURE OF ACETYLENE ON CU(111)

被引：71

作者：

BAO, S ^{[1
]}

SCHINDLER, KM ^{[1
]}

HOFMANN, P ^{[1
]}

FRITZSCHE, V ^{[1
]}

BRADSHAW, AM ^{[1
]}

WOODRUFF, DP ^{[1
]}

机构：

[1] UNIV WARWICK,DEPT PHYS,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND

来源：

SURFACE SCIENCE | 1993年 / 291卷 / 03期

关键词：

D O I：

10.1016/0039-6028(93)90448-S

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：

A quantitative structural study of the adsorption of acetylene on Cu(111) has been carried out by scanned energy mode photoelectron diffraction from the C ls core levels. The molecule is found to be adsorbed with the C-C axis almost parallel to the surface with the carbon atoms occupying the two symmetrically distinct three-fold coordinated hollow sites on the surface. The C to top Cu atom layer spacing appears to be slightly smaller (1.38 +/- 0.03 angstrom) above the ''fcc'' hollow site (above a third-layer Cu atom) than above the ''hcp'' hollow site (1.44 +/- 0.03 angstrom). The best fit to theory is obtained with the C atoms exactly in the three-fold symmetric sites of the substrate which constrains the C-C bondlength to a value (1.48 +/- 0.10 angstrom) substantially larger than that of the free molecule. This result is consistent with previously published vibrational spectroscopy from this adsorption system which indicates significant lowering of the C-C bond order.

引用

页码：295 / 308

页数：14

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