Abstract
The evolution features of electrons and ions generated by laser-blow-off (LBO) of a multi-component LiF-C target have been studied using optical spectroscopic and Langmuir probe (LP) techniques. In addition to the hydrodynamic plume splitting, multi-peak structures are reported in the temporal profiles of ions measured by the LP. We propose that the observed multi-peaks arise due to the mass dependent expansion velocity of different elements present in the plasma plume. The temporal evolutions of electron density and temperature are reported in vacuum and in a 10−2 mbar argon environment. The electron temperature of the LBO plume was found to be higher than the electron temperature of laser produced plasma from solids. It was observed that the LP was perturbing the evolving plasma plume when it was placed at a short distance from the target. We have experimentally determined the distance between the target and LP beyond which it did not perturb the characteristic features of plume expansion. No previous data related to LBO plasma exist for a direct comparison with the present results.
Published Version
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