An exception to the principle of selection in spectra

ABSTRACT IN a recent communication (_Phil. Mag._, April 1922) Messrs. Foote, Mohler, and Meggers have described the excitation of a certain type of combination lines in a new form of

discharge tube in which the _applied_ electrostatic field can exert no influence upon the radiation. Thereby they made it somewhat doubtful whether these and other exceptions to the

principle of selection can be attributed to the incipient Stark effect of the applied field, as suggested by Sommerfeld and others. In reply to this, Prof. N. Bohr has pointed out (_Phil.

Mag._, June, 1922) that, “owing to the screening from external forces, the experimental arrangement described would be especially favourable for the accumulation of ions in the region of the

discharge tube,” and that “the field due to the neighbouring ions and free electrons, to which the emitting atoms have been subject, may be of the order of magnitude claimed by the quantum

theory for the appearance of the new lines.” Consequently Prof. Bohr thinks that the results of Foote, Mohler, and Meggers do not furnish a sufficient basis for the conclusion they have

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Laboratory, Imperial College of Science and Technology, South Kensington, S.W.7. S. DATTA Authors * S. DATTA View author publications You can also search for this author inPubMed Google

Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE DATTA, S. An Exception to the Principle of Selection in Spectra. _Nature_ 110, 39 (1922).

https://doi.org/10.1038/110039b0 Download citation * Issue Date: 08 July 1922 * DOI: https://doi.org/10.1038/110039b0 SHARE THIS ARTICLE Anyone you share the following link with will be able

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