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The various charge states of gold ions in the field evaporation process

The investigation of various charge states of Au ions has been carried out using a TOF atom probe in the case of a pulsed field evaporation mode. Three charge states of Au ions (Au+, Au2+, Au3+) have been observed. The relative abundance of various-charge-state ions is strongly dependent on field strength, pulse fraction (Vp/VDC) as well as specimen temperature. The experimental results can be explained by the idea of post-ionisation.