Abstract

Abstract : The purpose of this program is the development and characterization of high brightness field emission and field ion sources. Several emitter materials and modes of operation for both field electron and ion sources have been investigated. The most promising sources have been examined with respect to fabrication techniques, source stability and life, spatial energy distribution of the emitted beam. Optical characteristics of the source, e.g. virtual source size, etc., have also been examined. From this study two electron and one gas phase field ion emitters have met most of the source requirements to be of interest for high current density submicron focussed beam applications. In addition, the liquid gallium source has been investigated with respect to both electron and ion emission. The electron emission mode exhibits an unusual high peak current pulse mode while the ion emission mode results in an extremely intense d.c. mode. The ion emission mode is 100 to 1000 times more intense than the gas phase field ion sources. (Author)

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