Time-resolved 2PPE:: Probing adsorbate motion on femtosecond time-scales -: what is the role of the laser bandwidth?

被引：9

作者：

Bauer, M ^{[1
]}

Wessendorf, M ^{[1
]}

Hoffmann, D ^{[1
]}

Wiemann, C ^{[1
]}

Mönnich, A ^{[1
]}

Aeschlimann, M ^{[1
]}

机构：

[1] TU Kaiserslautern, Dept Phys, D-67663 Kaiserslautern, Germany

来源：

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2005年 / 80卷 / 05期

关键词：

D O I：

10.1007/s00339-004-3126-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Recently it has been shown that time-resolved two photon photoemission spectroscopy (TR 2PPE) is capable of probing the atomic motion of an adsorbate after excitation by a femtosecond laser-pulse. In this paper we address the question in how far the bandwidth of the used laser pulse is of importance with respect to the sensitivity of TR 2PPE to the actual nuclear dynamics. In particular, we find that the use of laser pulses of different spectral bandwidth may simplify the interpretation of the measured TR 2PPE autocorrelation traces and help to distinguish between purely electron related contributions and the nuclear dynamics. Our experimental results indicate that for pulses of small bandwidth only the lifetime of the electronic adsorbate excitation at the ground state equilibrium distance is probed. This information can be used as input for the interpretation of autocorrelation traces obtained with large bandwidth pulses, which in addition contain information about the nuclear dynamics of the adsorbate.

引用

页码：987 / 994

页数：8

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