Letter | Published:

Selective Excitation of Spectra by the High-Frequency Discharge

Nature volume 150, page 123 (25 July 1942) | Download Citation



IN a series of preliminary investigations on the excitation of spectra by the high-frequency discharge, several interesting phenomena connected with intensity distribution have been observed, some of which have already been reported1. Further work indicates that these consist essentially in a redistribution of intensity among different band-systems of a diatomic molecule (that is, among different electronic energy levels) or among atomic energy states of different multiplicities. Thus the mercury spectrum observed shows that under certain well-defined and reproducible conditions, as for example pressure of gas, frequency of exciting oscillations, etc., only those lines are present which involve triplet initial states. Similarly, again under definite conditions, mainly those band systems of carbon monoxide are excited which involve only the singlet levels.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.


  1. 1.

    , and , Proc. Ind. Sci. Cong., Part 3, 35 (1942). , and . Proc. Ind. Sci. Cong., Part 3, 35 (1942).

  2. 2.

    , Proc. Roy. Soc. A., 146, 177 (1934) also 150, 371 (1935). , Ann. Phys., 25/2, 166 (1936).

  3. 3.

    , Phil. Mag., 48, 1069 (1924).

  4. 4.

    and , Proc. Roy. Soc., A, 85, 377 (1911).

Download references

Author information


  1. College of Science, Benares Hindu University, May 8.

    • R. K. ASUNDI


  1. Search for R. K. ASUNDI in:

  2. Search for NAND LAL SINGH in:

About this article

Publication history





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.