Direct observation of space charge dynamics by picosecond low-energy electron scattering

被引：10

作者：

Cirelli, C. ^{[1
,2
]}

Hengsberger, M. ^{[1
]}

Dolocan, A. ^{[1
]}

Over, H. ^{[2
]}

Osterwalder, J. ^{[1
]}

Greber, T. ^{[1
]}

机构：

[1] Univ Zurich Irchel, Inst Phys, CH-8057 Zurich, Switzerland

[2] Univ Giessen, Inst Phys Chem, D-35392 Giessen, Germany

来源：

EPL | 2009年 / 85卷 / 01期

基金：

瑞士国家科学基金会;

关键词：

EMISSION; FEMTOSECOND; DIFFRACTION; METALS; GAS; EXCITATION;

D O I：

10.1209/0295-5075/85/17010

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The transient electric field governing the dynamics of space charge is investigated by time-and energy-resolved low-energy electron scattering. The space charge above a copper target is produced by high-intensity femtosecond laser pulses. The pump-probe experiment has a measured temporal resolution of better than 35 ps at 55 eV probe electron energy. The probe electron acceleration due to space charge is reproduced within a 3-dimensional non-relativistic model, which determines an effective number of electrons in the space charge cloud and its initial diameter. Comparison of the simulations with the experiments indicates a Coulomb explosion, which is consistent with transients in the order of 1 ns, the terminal kinetic energy of the cloud and the thermoemission currents predicted by the Richardson-Dushman formula. Copyright (C) EPLA, 2009

引用

页数：5

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