Abstract
THE first mass-speetra of chromium were obtained by means of accelerated anode rays. The results were very feeble and only showed one line of mass number 52 (NATURE, Sept. 22, 1923, p. 449). I have now been able to make experiments with a volatile compound of this metal, the solid carbonyl, Cr(CO)6, kindly prepared for me by Dr. A. v. Grosse, of Berlin. The vapour pressure of this is low but sufficient for use in the ordinary discharge tube when suitable arrangements are made. The intensity of the beam of mass-rays has been so increased that not only has it been possible, by the use of fine slits, to obtain a value for the packing fraction of Cr52 but also, by the use of coarse slits and long exposures, to reveal no less than three new isotopes, and to determine their relative abundance photometrically as follows:
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ASTON, F. Constitution of Chromium. Nature 126, 200 (1930). https://doi.org/10.1038/126200a0
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DOI: https://doi.org/10.1038/126200a0
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