Electron and ion stagnation at the collision front between two laser produced plasmas

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Title: Electron and ion stagnation at the collision front between two laser produced plasmas
Authors: Hough, Pádraig
McLoughlin, Conor
Kelly, Thomas J.
Hayden, Patrick
Harilal, Sivanandan S.
Mosnier, Jean-Paul
Costello, John T.
Permanent link: http://hdl.handle.net/10197/3557
Date: 7-Mar-2009
Abstract: We report results from a combined optical interferometric and spectrally resolved imaging study on colliding laser produced aluminium plasmas. A Nomarski interferometer was used to probe the spatio-temporal distribution of the electron density at the collision front. Analysis of the resulting interferograms reveals the formation and evolution of a localised electron density feature with a well defined profile reminiscent of a stagnation layer. First signs of electron stagnation are observed at a time delay of 10 ns after the peak of the plasma generating laser pulse. The peak electron density was found to exceed 1019 cm−3 and the layer remained well defined up to a time delay of ca. 100 ns. Temporally and spectrally resolved optical imaging was also undertaken to compare the Al+ ion distribution, with that of the 2D electron density profile. This revealed nascent stagnation of singly charged ions at a delay time of 20 ns. We attribute these results to the effects of space charge separation in the seed plasma plumes.
Funding Details: Science Foundation Ireland
Higher Education Authority
Irish Research Council for Science, Engineering and Technology
Type of material: Journal Article
Publisher: Institute of Physics
Copyright (published version): 2009 IOP Publishing
Keywords: PlasmasLasersElectron density profileIon distributionStagnation layerColliding plasmas
Subject LCSH: Laser plasmas
Electron distribution
Plasma dynamics
Laser ablation
DOI: 10.1088/0022-3727/42/5/055211
Language: en
Status of Item: Peer reviewed
Appears in Collections:Physics Research Collection

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