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25 Oct 1999

Volume 75, Issue 17, pp. 2521-2692

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The effect of laser-produced plasma expansion on the ion population

J. Krása, L. Láska, K. Rohlena, M. Pfeifer, J. Skála, B. Králiková, P. Straka, E. Woryna, and J. Wolowski

Appl. Phys. Lett. 75, 2539 (1999); http://dx.doi.org/10.1063/1.125070 (3 pages) | Cited 11 times

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Changes in the ion population during the expansion of Ag, Cu, Pb, and Ta laser-produced plasmas in vacuum were simultaneously measured with two coaxial ion collectors between 82 and 187 cm from a target. The plasma was produced with an iodine laser delivering a power density up to ∼ 1015 W/cm2 onto the target. It was experimentally proved that the charge Q of expanding ions and the corresponding ion current density j are really decreasing with the distance L as Q∝L−2 and j∝L−3, respectively. It implies that the “freezing” of charge states dominates in that interval of L. © 1999 American Institute of Physics.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
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