A charge density profile of ions emitted from a laser ion source is derived from a time-resolved current of ions collected with a time-of-flight detector. This relationship between the density profile over path of ions and an ion current observed far from the ion source is based on a similarity relationship for ion currents with" frozen" charges observed at different distances from the target. In this contribution, we present distance-of-flight spectra of the charge density of ions emitted from various plasmas driven by a Compex 205 KrF excimer laser (λ= 248 nm, τ FWHM= 23ns) which works at laser irradiances between 10 8 and 10 10 W/cm 2.
24 Apr 2014
Volume: 508 Issue: 1 Pages: 012004
Journal of Physics: Conference Series