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

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 t...

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Bibliographic Details
Published in:Applied physics letters 1999-10, Vol.75 (17), p.2539-2541
Main Authors: Krása, J., Láska, L., Rohlena, K., Pfeifer, M., Skála, J., Králiková, B., Straka, P., Woryna, E., Wolowski, J.
Format: Article
Language:English
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.125070