Abstract
COMPARISONS of the spectra of the isotopes of lead have shown that they are indentical, except for slight wave-length differences of the order of a few thousandths of an Ångström unit. Our inability completely to separate the isotopes of other non-radio-active elements in quantities for spectroscopic investigation has left this the only experimental result of a direct nature. In order to find possible evidences of the effect in two other elements, the writer has made an accurate comparison of the spectra of samples of mercury having different atomic weights, and also of similar samples of chlorine. These have been produced by long-continued fractional diffusions in the laboratory of Prof. W. D. Harkins, who kindly made them available for this investigation.
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JENKINS, F. The Line Spectra of Isotopes. Nature 117, 893 (1926). https://doi.org/10.1038/117893b0
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DOI: https://doi.org/10.1038/117893b0
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