Abstract
The post-ionization model of field evaporation is shown to be consistent with observations of singly and doubly charged ions in liquid metal field ion sources. The model can be used to estimate the field strength at the apex of the Taylor cone which is found to be 1.9–2.0 V/A for a Ga source. Experiments to test the post-ionization model and to determine the apex field strength more accurately are suggested. A possible method of obtaining ∼μA currents of highly charged ions, e.g. Zr4+, Ta4+, Ga3+, As3+, is proposed.
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