Local probing of the surface chemical bond using X-ray emission spectroscopy

被引：59

作者：

Nilsson, A ^{[1
]}

Wassdahl, N ^{[1
]}

Weinelt, M ^{[1
]}

Karis, O ^{[1
]}

Wiell, T ^{[1
]}

Bennich, P ^{[1
]}

Hasselstrom, J ^{[1
]}

Fohlisch, A ^{[1
]}

Stohr, J ^{[1
]}

Samant, M ^{[1
]}

机构：

[1] IBM CORP,ALMADEN RES CTR,DIV RES,SAN JOSE,CA 95120

来源：

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 1997年 / 65卷 / 02期

关键词：

D O I：

10.1007/s003390050557

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

X-ray emission spectroscopy applied to adsorbate systems is shown to reveal new details of the chemical bond formed at surfaces. An atom and symmetry projected view of the bonding orbitals is obtained. We will present recent studies of N-2 and CO on Ni(100), benzene on Ni(100) and Cu(110), and glycine adsorbed on Cu(110). New types of molecular states are observed which are directly related to the surface chemical bond. The long-accepted Blyholder model which is based on a frontier orbital concept cannot explain our results for N-2 and CO chemisorption. We find it necessary to offer a new picture where changes in the whole molecular orbital framework have to be considered. We show that both pi and sigma type interactions are important in describing the bonding in benzene to metal surfaces. The future prospect is illustrated by the adsorption of the simplest amino acid, glycine, on Cu(110). The adsorbate has four different atomic centers where X-ray emission spectra are obtained, providing a unique view of the local electronic structure.

引用

页码：147 / 154

页数：8

共 34 条

[1] C(2X2)CO ON NI(100) - PHOTOEMISSION ORIENTATION DETERMINATION [J].