Abstract
BY the systematic use of the purest materials, I have succeeded in reducing the effect of potassium in the mass-spectrum of calcium to a negligible quantity. Under these conditions, the line 41 disappears completely and it is quite safe to conclude that the isotope Ca 41 does not exist, at least to 1 part in 1000, in the element. Photometry gives the following provisional constitution for calcium:
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References
Phys. Rev., 20, 633; 1922.
NATURE, 131, 688, May 13, 1933.
NATURE, 133, 746, May 19, 1934.
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ASTON, F. Calcium Isotopes and the Problem of Potassium. Nature 133, 869 (1934). https://doi.org/10.1038/133869b0
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DOI: https://doi.org/10.1038/133869b0
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