Abstract
A versatile, spherical-geometry, self-extraction surface ionization source has been designed, fabricated, and characterized. The source utilizes direct-surface ionization to form either positive or negative ion beams resulting from interactions between highly electropositive or electronegative atoms or molecules and a spherical-sector surface ionizer maintained at ∼ 1100°C. For positive ion generation, the surface ionizer is chosen to be a high-work-function metal such as Mo, Ta, or W; while for negative ion formation, a LaB 6 surface ionizer is selected. The design features and performance of the source for each of these modes of operation are discussed in this report.
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