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A time resolved experiment to investigate the ultrafast dynamics following anion impact onto a solid surface requires an ultrashort ion pump pulse incombination with a properly synchronized and time resolved probe. In order torealize such an experiment, we have investigated a strategy to use femtosecondlaser photoionization of atoms entrained in a pulsed supersonic jet for theproduction of sufficiently short ion pulses. While the generation of Ar$^{q+}$ions was targeted in previous work, it has in the meantime been demonstratedthat argon is not suitable due to extensive cluster formation in the supersonicexpansion. Here, we therefore present numerical simulations investigating theuse of neon as a precursor gas and show the feasibility of pulses containing upto ~1000 Ne$^{q+}$ ions at keV energies and picosecond duration. In theprocess, we demonstrate that space charge broadening can be significantlyreduced by detuning the flight time focusing conditions of an ion bunchingsystem. Moreover, the results show that a controlled variation of the bunchergeometry and potentials permits the generation of picosecond pulses at variableion energy between 1 keV and 5 keV.

Ultrashort Ne$^{q+}$ Ion Pulses for Use in Pump-Probe Experiments: Numerical Simulations