Abstract
The process of calcium ionization on a rhenium filament was studied at different heating conditions of the evaporation filament (EF) loaded with a CaI 2 sample. The analysis indicated that three different ionization processes are involved in the ionization; (1) CaI 2 → Ca +, (2) CaI → Ca +, and (3) Ca → Ca +. Reaction (1) appears at the low temperatures of EF, reaction (2) is dominant in the medium temperature region, and reaction (3) appears at the high temperature of EF. These facts suggest that the EF assists the dissociation of CaI 2. Experiments are extended to the isotopic ratio measurement using different materials of Ta, Re, and Pt for the evaporation filament.
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