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

Source: J. Appl. Phys. 107, 024904 (2010); doi:10.1063/1.3282683

Published 25 January 2010

KEYWORDS and PACS
Keywords
PACS
  • 52.25.Os
    Emission, absorption, and scattering of electromagnetic radiation from plasmas
  • 52.25.Fi
    Plasma transport properties
  • 52.40.Mj
    Particle beam interactions in plasmas
  • 52.50.Jm
    Plasma production and heating by laser beams
  • 52.20.Hv
    Atomic, molecular, ion, and heavy-particle collisions in plasma
  • YEAR: 2010
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PUBLICATION DATA
ISSN:
1553-9601 (online)
Publisher:
AIP is a member of CrossRef AIP
P. Hough,1 C. McLoughlin,1 S. S. Harilal,2 J. P. Mosnier,1 and J. T. Costello1
1School of Physical Sciences and National Centre for Plasma Science and Technology (NCPST), Dublin City University, Glasnevin, Dublin 9, Ireland
2School of Nuclear Engineering, Purdue University, 400 Central Drive, West Lafayette, Indiana 47907, USA
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 (Deltat<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. ©2010 American Institute of Physics
History: Received 22 September 2009; accepted 26 November 2009; published 25 January 2010
Permalink: http://link.aip.org/link/?JAPIAU/107/024904/1

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