Can we control lifetimes of electronic states at surfaces by adsorbate resonances?

被引：50

作者：

Hotzel, A

Ishioka, K

Knoesel, E

Wolf, M

Ertl, G

机构：

[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

[2] Natl Res Inst Met, Tsukuba, Ibaraki 305, Japan

来源：

CHEMICAL PHYSICS LETTERS | 1998年 / 285卷 / 3-4期

关键词：

D O I：

10.1016/S0009-2614(98)00054-2

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：

Femtosecond time-resolved two-photon photoemission is used to study the excited electronic states of a Cu(lll) surface covered with a monolayer of physisorbed O-2 on top of one to five Xe spacer layers. The spectra are dominated by a state 4.0 eV above E-F whose lifetime depends strongly on the number of Xe spacer layers. The lifetime decreases with increasing number of spacer layers from (650 +/- 30) fs for one Xe layer to (90 +/- 10) fs for five layers. To explain this trend we propose a model where the image potential states couple to a negative-ion resonance of the O-2 molecule. (C) 1998 Elsevier Science B.V.

引用

页码：271 / 277

页数：7

共 24 条

[1] Femtosecond pump-probe photoelectron spectroscopy: Mapping of vibrational wave-packet motion [J].