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Abstract
A droplet emission mechanism is proposed for the operation of liquid metal ion sources in the so-called 'droplet mode'. The model is based on experimental observations of current oscillograms as a function of beam angle, as well as emission frequency spectra, and is supported by theoretical arguments. It is suggested that the main droplet emission mode is one where the jet-like apex of the cone-shaped liquid anode is driven unstable by oscillation of the cone. Since jet break-up times are much shorter than the cone oscillation period, the cone oscillation frequency determines the frequency of droplet emission.
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