Societies and Academies

    Abstract

    London Royal Society, November 11. F. W. ASTON: A second-order focusing mass spectrograph and isotopic weights by the doublet method. Several improvements have been embodied in this instrument, including adjustable slits and second-order focusing. The instrument has a resolving power of 2,000 and an accuracy of measurement approaching 1 in 106. By its means, a large number of natural doublets have been measured. In many of these, one member is a hydrocarbon molecule, hence the isotopic weight of 12C has been ascertained with particular care. From the results obtained the packing fractions and isotopic weights of more than twenty atomic species are tabulated, some for the first time.

    Rights and permissions

    Reprints and Permissions

    About this article

    Cite this article

    Societies and Academies. Nature 140, 905 (1937). https://doi.org/10.1038/140905a0

    Download citation

    Comments

    By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.