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Plasmas induced by UV laser ablation have been studied and analysed using time-of-flight measurements. A KrF laser beam of 23 ns FWHM time duration was focused into Si and Nb targets with a moderate laser fluence of 2 J/cm 2. A suitable theoretical expressions were derived for fitting the recorded ion current under the assumption of a" shifted" Maxwell-Boltzmann velocity distribution. The deconvolution of time resolved ion current signals, taking into account a multi-mode velocity distribution has revealed that the contribution of the different charge states of ions in the plasma induces electric field which accelerate the expanding plasma along the target normal.
IOP Publishing
Publication date: 
1 May 2010

A Lorusso, V Nassisi, L Velardi, MV Sicilano

Biblio References: 
Volume: 227 Issue: 1 Pages: 012037
Journal of Physics: Conference Series