Letter | Published:

Absorption Spectrum of Indium Vapour in the Schumann Region

Nature volume 166, page 150 (22 July 1950) | Download Citation

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Abstract

THE ground-state of the indium atom is 5s2 5p 2P0½ and the term system responsible for the ordinary series spectrum—that is, the system built on the 5s2 S0 ground-state of the ion—was summarized and extended by Paschen1. Also included in his list are the following three terms: 5s5p2 4P, 5s5p2 2D and 5s5p6s 4P. Of these, the first-named was originally identified by Sawyer and Lang2 and by Lansing3 independently, and seems well established; the other two terms are much more tentative. The sp2-configuration should give other, hitherto unidentified terms, 2S and 2P, remembering that the use of Russell-Saunders symbols is merely conventional, as we are dealing with a case which probably departs markedly from LS-coupling. Rough estimates indicate that these terms, and those of other configurations in which two electrons are excited, will lie above the normal ionization potential.

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References

  1. 1.

    , Ann. Physik., 32, 148 (1938).

  2. 2.

    , and , Phys. Rev., 34, 712 (1929).

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    , Phys. Rev., 34, 597 (1929).

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    For references, see , Rev. Mod. Phys., 13, 1 (1941).

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  1. Department of Physics, Imperial College of Science and Technology, Imperial Institute Road, London, S.W.7. March 7.

    • W. R. S. GARTON

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https://doi.org/10.1038/166150a0

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