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A simple and inexpensive ion source has been developed for collision dynamic studies. The negative halogen ions are produced by negative surface ionization at a hot surface of LaB6. Because of the selectivity of this ionization process mass selection is not necessary. Emission densities of 10−4 A/cm2 at an energy spread of 0.55 eV are obtained.
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Kashihira et al. (1977) studied this question.
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