Abstract
CONTINUING work with my second-order focusing mass-spectrograph, the doublet 31 formed by P and CF has been measured by the use of a mixture of phosphine, carbon tetrafluoride and helium in the discharge. On some of the plates obtained well-matched doublets appeared at 28 due to Si and CO derived from the walls of the tube. This was very fortunate, for the intensities of these lines are virtually beyond any ordinary control. The value of the packing fraction of 28Si deduced is only slightly different from that already given.
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References
NATURE, 137, 357 (February 29, 1936); 137, 613 (April 11, 1936).
Phys. Rev., 49, 883 (1936).
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ASTON, F. Isotopic Weights by the Doublet Method. Nature 138, 1094 (1936). https://doi.org/10.1038/1381094a0
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DOI: https://doi.org/10.1038/1381094a0
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