Abstract
IN a communication under this title in NATURE of April 17, p. 554, N. Seljakow and A. Krasnikow have inferred from measurements on the lines Kβ1 and Kβ′ in the Röntgen spectrum of manganese, that they form a relativity doublet characterised by the energy difference MII – MIII. Now with molybdenum the corresponding difference is about units, whereas with elements of lower atomic number similar measurements have so far not been published. The very small value found for molybdenum makes it reasonable to suppose that, for the elements between calcium and zinc in the periodic system, the corresponding energy difference would not give rise to any separable lines. For even if we assume the appearance of 33-orbits, which begin with scandium, to cause a disturbance in the M-level, so that the 32-orbits are unequally screened for this and the next element, it still follows from an approximate calculation that this effect cannot possibly give rise to a larger difference than about one-third of that actually measured. On the other hand, the broadening of the K-doublet of iron found by Siegbahn and Ray (Ark. Mat., Astr. Fysik, vol. 18, No. 19) and recently studied by Thoraeus (Phil. Mag. (7), vol. i. p. 312, 1926), which represents a much smaller value of the energy difference, may well be attributed to such a screening effect of the 33-orbits, as this would, of course, be equivalent to a slight increase of the nuclear charge.
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ORTNER, G. New Experimental Results concerning the Doublet Kβ1. Nature 117, 823 (1926). https://doi.org/10.1038/117823a0
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DOI: https://doi.org/10.1038/117823a0
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