A phosphorus liquid-metal-ion source that uses a Cu–P alloy as its source material is described. The P+ ion emission current is about 10% of total emission current, which consists mainly of Cu+ ions. Energy spread of P+ ions is 25 eV at a total current of 30 µA, while that of Cu+ is 28 eV. A source lifetime of more than 20 hours is achieved at a total current of 50–60 µA.
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Ishitani et al. (1984) studied this question.
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