An in-depth investigation into the temperature dependence of the mass spectra of the beam produced by a Au82Si18 liquid metal field emitter

The mass spectra of the beam emitted by a Au82Si18 eutectic molten metal ion source are investigated in detail, as a function of emitter temperature. At the conclusion of the work it emerges that while Au+, Si+ and Si++ are the result of direct field-evaporation from the liquid surface, Au++ forms by the post-ionisation of Au+. Cluster ions are most probably the product of droplet break-up.