Letter | Published:

Absorption Spectrum of Indium Vapour in the Schumann Region

Naturevolume 166page150 (1950) | Download Citation



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.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.


  1. 1

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

  2. 2

    Sawyer, R. A., and Lang, R. J., Phys. Rev., 34, 712 (1929).

  3. 3

    Lansing, W. D., Phys. Rev., 34, 597 (1929).

  4. 4

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

Download references

Author information


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

    • W. R. S. GARTON


  1. Search for W. R. S. GARTON in:

About this article

Publication history

Issue Date



Further reading


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.