Space charge corrected electron emission from an aluminum surface under non-equilibrium conditions

A theoretical study has been conducted of ultrashort pulsed laser induced electron emission from an aluminum surface. Electron emission fluxes retrieved from the commonly employed Fowler-DuBridge theory were compared to fluxes based on a laser-induced non-equilibrium electron distribution. As a resu...

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Veröffentlicht in:Journal of applied physics 2012-06, Vol.111 (11)
Hauptverfasser: Wendelen, W., Mueller, B. Y., Autrique, D., Rethfeld, B., Bogaerts, A.
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container_issue 11
container_start_page
container_title Journal of applied physics
container_volume 111
creator Wendelen, W.
Mueller, B. Y.
Autrique, D.
Rethfeld, B.
Bogaerts, A.
description A theoretical study has been conducted of ultrashort pulsed laser induced electron emission from an aluminum surface. Electron emission fluxes retrieved from the commonly employed Fowler-DuBridge theory were compared to fluxes based on a laser-induced non-equilibrium electron distribution. As a result, the two- and three-photon photoelectron emission parameters for the Fowler-DuBridge theory have been approximated. We observe that at regimes where photoemission is important, laser-induced electron emission evolves in a more smooth manner than predicted by the Fowler-DuBridge theory. The importance of the actual electron distribution decreases at higher laser fluences, whereas the contribution of thermionic emission increases. Furthermore, the influence of a space charge effect on electron emission was evaluated by a one dimensional particle-in-cell model. Depending on the fluences, the space charge reduces the electron emission by several orders of magnitude. The influence of the electron emission flux profiles on the effective electron emission was found to be negligible. However, a non-equilibrium electron velocity distribution increases the effective electron emission significantly. Our results show that it is essential to consider the non-equilibrium electron distribution as well as the space charge effect for the description of laser-induced photoemission.
doi_str_mv 10.1063/1.4729071
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The importance of the actual electron distribution decreases at higher laser fluences, whereas the contribution of thermionic emission increases. Furthermore, the influence of a space charge effect on electron emission was evaluated by a one dimensional particle-in-cell model. Depending on the fluences, the space charge reduces the electron emission by several orders of magnitude. The influence of the electron emission flux profiles on the effective electron emission was found to be negligible. However, a non-equilibrium electron velocity distribution increases the effective electron emission significantly. 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subjects ALUMINIUM
BEAMS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DISTRIBUTION
ELECTRON EMISSION
EQUILIBRIUM
LASER RADIATION
MULTI-PHOTON PROCESSES
PHOTOEMISSION
SIMULATION
SPACE CHARGE
SURFACES
THERMIONIC EMISSION
title Space charge corrected electron emission from an aluminum surface under non-equilibrium conditions
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