Real-time observation of adsorbate atom motion above a metal surface

被引：227

作者：

Petek, H

Weida, MJ

Nagano, H

Ogawa, S

机构：

[1] Hitachi Ltd, Adv Res Lab, Hatoyama, Saitama 3500395, Japan

[2] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA

来源：

SCIENCE | 2000年 / 288卷 / 5470期

关键词：

D O I：

10.1126/science.288.5470.1402

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The dynamics of cesium atom motion above the copper(lll) surface following electronic excitation with light was studied with femtosecond (10(-15) seconds) time resolution. Unusual changes in the surface electronic structure within 160 femtoseconds after excitation, observed by time-resolved two-photon photo-emission spectroscopy, are attributed to atomic motion in a copper-cesium bond-breaking process. Describing the change in energy of the cesium antibonding state with a simple classical model provides information on the mechanical forces acting on cesium atoms that are "turned on" by photoexcitation. Within 160 femtoseconds, the copper-cesium bond extends by 0.35 angstrom from its equilibrium value.

引用

页码：1402 / 1404

页数：3

共 20 条

[11] Time-resolved coherent photoelectron spectroscopy of quantized electronic states on metal surfaces [J].