Surface collective excitations in ultrafast pump-probe spectroscopy of metal nanoparticles

被引：22

作者：

Shahbazyan, TV ^{[1
]}

Perakis, IE ^{[1
]}

机构：

[1] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

来源：

CHEMICAL PHYSICS | 2000年 / 251卷 / 1-3期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0301-0104(99)00311-0

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：

The role of surface collective excitations in the electron relaxation in small metal particles is studied. It is shown that the dynamically screened electron-electron interaction in a nanoparticle contains a size-dependent correction induced by the surface. This leads to new channels of quasiparticle scattering accompanied by the emission of surface collective excitations. In noble-metal particles, the dipole collective excitations (surface plasmons) mediate a resonant scattering of d-holes to the conduction band. The role of this effect in the ultrafast optical dynamics of small nanoparticles is studied. With decreasing nanoparticle size, it leads to a drastic change in the differential absorption lineshape and a strong frequency dependence of the relaxation near the surface plasmon resonance. The experimental implications of these results in ultrafast pump-probe spectroscopy are addressed. We also discuss the size-dependence of conduction electron scattering rates. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：37 / 49

页数：13

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