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Emission characteristics and dynamics of the stagnation layer in colliding laser produced plasmas

Hough, Pádraig and McLoughlin, Conor and Harilal, Sivanandan S. and Mosnier, Jean-Paul and Costello, John T. (2010) Emission characteristics and dynamics of the stagnation layer in colliding laser produced plasmas. Journal of Applied Physics, 107 (2). ISSN 0021-8979

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Abstract

The expansion dynamics of ion and neutral species in laterally colliding laser produced aluminum plasmas have been investigated using time and space resolved optical emission spectroscopies and spectrally and angularly resolved fast imaging. The emission results highlight a difference in neutral atom and ion distributions in the stagnation layer where, at a time delay of 80 ns, the neutral atoms are localized in the vicinity of the target surface 1 mm from the target surface while singly and doubly charged ions lie predominantly at larger distances, 1.5 and 2 mm, respectively. The imaging results show that the ions were found to form a well defined, but compressed, stagnation layer at the collision front between the two seed plasmas at early times (Dt ~ 80 ns). On the other hand, the excited neutrals were observed to form a V-shaped emission feature at the outer regions of the collision front with enhanced neutral emission in the less dense, cooler regions of the stagnation layer.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:colliding plasmas; stagnation layer; atom distribution; ion distribution; fast photography; optical emission spectroscopy;
Subjects:Physical Sciences > Laser plasmas
Physical Sciences > Physics
Physical Sciences > Lasers
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:American Institute of Physics
Official URL:http://dx.doi.org/10.1063/1.3282683
Copyright Information:©2010 American Institute of Physics
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland, Irish Research Council for Science Engineering and Technology, DCU International Visiting Fellows Programme
ID Code:15135
Deposited On:03 Feb 2010 15:37 by Padraig Hough. Last Modified 10 Aug 2010 13:57

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