Abstract
The construction of a parallel-plate electrostatic energy-analyser equipped with a channel-plate focal-plane detector and a novel acceleration electrode assembly has allowed the intrinsic energy losses of field-evaporated ions to be measured for the first time, under effectively steady-state conditions. It is found that the ions have energy losses which are considerably less than originally predicted by the Lucas plasmon-loss theory (1971); the losses are shown to be of the same order as those expected from the charge-exchange or image-potential theories of field evaporation, but exact numerical agreement is not easily attained at present.
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