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


Cirelli, C; Hengsberger, M; Dolocan, A; Over, H; Osterwalder, J; Greber, T (2009). Direct observation of space charge dynamics by picosecond low-energy electron scattering. EPL (Europhysics Letters), 85(1):17010.

Abstract

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.

Abstract

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.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:January 2009
Deposited On:14 Apr 2009 09:19
Last Modified:17 Feb 2018 22:47
Publisher:EDP Sciences ; Institute of Physics Publishing (IOP)
ISSN:0295-5075
OA Status:Green
Publisher DOI:https://doi.org/10.1209/0295-5075/85/17010

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