The electric field driven acceleration of plasma ions is an intrinsic effect in laser-induced plasma plumes and is responsible for the generation of high-energy ions. At high laser fluences (≥ 2 J/cm2), multiply charged ions are formed and affect the plume expansion dynamics. In this paper, we used kinetic energy-resolved mass spectrometry to investigate the relative abundance and kinetic energy distributions of singly- and doubly-charged ions produced by KrF-laser ablation of nine different oxide targets. The doubly charged metal ions with a lower mass-to-charge (m/z) ratio show narrow energy distributions at high average kinetic energies coinciding with the cutoff energies for the singly-charged ion distributions. The observation suggests that the recombination of higher charged ions plays a prominent role in the formation of the high-energy tail for singly-charged ions. The results are discussed in terms of component volatility and a dynamic double layer, where ions with different m/z values experience different accelerations.

HiLASE Centre Institute of Physics ASCR Za Radnicí 828 25241 Dolní Břežany Czech Republic

Laboratory of Inorganic Chemistry Department of Chemistry and Applied Biosciences ETH Zürich 8093 Zurich Switzerland

Research With Neutrons and Muons Division Paul Scherrer Institut 5232 Villigen PSI Switzerland

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Double layer acceleration of ions with differently charged states in a laser induced plasma