期刊
EPL
卷 85, 期 1, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1209/0295-5075/85/17010
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资金
- Deutsche Forschungsgemeinschaft
- Swiss National Science Foundation
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
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