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Vacuum-ultraviolet resonant photoabsorption imaging of laser produced plasmas

Hirsch, John S. and Meighan, Oonagh and Mosnier, Jean-Paul and van Kampen, Paul and Whitty, William and Costello, John T. and Lewis, C. L. S. and MacPhee, A. G. and Hirst, G. J. and Westhall, J. and Shaikh, W. (2000) Vacuum-ultraviolet resonant photoabsorption imaging of laser produced plasmas. Journal of Applied Physics, 88 (9). pp. 4953-4960. ISSN 0021-8979

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Abstract

We present results from a vacuum-ultraviolet (VUV) "photoabsorption imaging" technique based on the measurement of the time and space resolved absorption of a quasimonochromatic VUV beam from a laser plasma light source. The use of VUV radiation as a probe beam permits direct access to resonance lines of (singly and more highly charged) ions and also to the resonant and nonresonant continua of atoms and ions. In this experiment we have confined ourselves to measurements using the 3p–3d resonances of Ca, Ca+, and Ca2+ as markers of the temporal and spatial distribution of ground state atoms and ions in an expanding laser plasma plume. We show how time resolved column density maps may be extracted from such images. In addition we have extracted plasma plume velocities from the data, which compare well with an analytical laser ablation model.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:plasma production by laser; plasma diagnostics; ultraviolet spectra; light absorption; time resolved spectra; ground states; plasma density;
Subjects:Physical Sciences > Plasmas
Physical Sciences > Physics
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/10.1063/1.1314306
Copyright Information:© 2000 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics and may be found at http://dx.doi.org/10.1063/1.1314306 .
Funders:Enterprise Ireland
ID Code:15656
Deposited On:12 Aug 2010 10:20 by DORAS Administrator. Last Modified 12 Aug 2010 10:20

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