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Ion emission characteristics from laser-produced plasmas with steep density gradients

Published online by Cambridge University Press:  09 March 2009

K. Rohr ,
R. Dinger  and
H. Weber
K. Rohr
Affiliation:
Universität Kaiserslautern, Fachbereich Physik, D-6750 Kaiserslautern, West-Germany
R. Dinger
Affiliation:
Universität Kaiserslautern, Fachbereich Physik, D-6750 Kaiserslautern, West-Germany
H. Weber
Affiliation:
Universität Kaiserslautern, Fachbereich Physik, D-6750 Kaiserslautern, West-Germany
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Abstract

Ion emission from laser-produced plasma with small focal spots (20 μm) has been investigated for s- and p-polarization of the Nd–YAG laser at IL = 6 * 1013 W/cm2. The target has been Plexiglas (Hg, C5, O2) n, and the ion analysis has been charge, mass and velocity resolved for emission angles between 15° and 65°. It is found that additional resonance absorption mainly leads to an enhancement of the number of totally emitted ions which is essentially uniform for a large region of the velocity spectrum. The total increase in plasma expansion energy is by a factor of more than 3·5. The relatively low enhancement of the average initial temperature produces an unexpected asymptotic charge distribution with higher charges if resonance absorption is not present.

Type
Research Article
Information
Laser and Particle Beams , Volume 7 , Issue 1 , February 1989 , pp. 157 - 163
Copyright
Copyright © Cambridge University Press 1989

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