Abstract
The purification of calcium and barium has been carried out by double ultra high vacuum “reactive distillation” of these metals in a molybdenum column. The distributions of all elemental impurities and molecular species in the starting materials and in various fractions of the distillate were determined with spark source mass spectrographic analysis. The residual gases before, during and after distillation were analyzed by a quadrupole mass spectrometer. The total contents of metallic impurities (carbon and silicon included) of the double distilled metals were, in calcium 124 at. ppm and in barium 69 at. ppm.
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