Volume 85, Number 1, January 2009
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 January 2009|
Direct observation of space charge dynamics by picosecond low-energy electron scattering
Physik-Institut, Universität Zürich-Irchel - Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
2 Physikalisch-Chemisches Institut, Justus Liebig Universität - Heinrich-Buff-Ring 58, D-35392 Giessen, Germany, EU
Corresponding author: email@example.com
Accepted: 5 December 2008
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.
PACS: 78.47.jc – Time resolved spectroscopy ( > 1 psec) / 87.64.Bx – Electron, neutron and X-ray diffraction and scattering / 79.40.+z – Thermionic emission
© EPLA, 2009
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