Tuesday, July 23, 2013

1307.5596 (Yangjie Liu et al.)

Space charge effect of the time-dependent ultrafast laser excited
electron emission from a metal surface

Yangjie Liu, L. K. Ang
A model has been constructed to the study the transition of ultrafast laser excited electron emission from a metallic surface to the space charge limited (SCL) regime. By considering the time-dependent emission process by L. Wu et al. [Phys. Rev. B.78 224112 (2008)], we include the space charge effect which will affect the barrier at the emitting surface. At the high laser field, it is found that space charge effect cannot be ignored and the SCL current emission is reached. The threshold of the laser field to reach the SCL regime is determined. Our calculations agree well with particle-in-cell simulation results. This model is also compared with the classical short pulse SCL current model by A. Valfellset al. [Phys. Plasmas 9, 2377 (2002)].
View original: http://arxiv.org/abs/1307.5596

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