Excitation of Forbidden Spectral Lines

Details Excitation of Forbidden Spectral Lines Excitation of Forbidden Spectral Lines

Feb 1925

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1925natur.115..265f&link_type=abstract

Nature, Volume 115, Issue 2886, pp. 265 (1925).

Physics

Scientific paper

HANSEN, Takamine, and Werner (Kgl. Danske Videnskab. Selskab Mathfys. Medd. 3) have observed the line 1S - 2p1 (Paschen's notation) of mercury in a condensed discharge, and Takamine and Fukuda (Phys. Rev. 25, p. 23, 1925) have found the line strongly developed in the glow of a branched arc. We have excited this line, the corresponding line of zinc, and both 1S - 2p1 and 1S - 2p3 of cadmium in the positive column of a hot-cathode discharge. The positive column was viewed end-on while the cathode glow was confined to a side tube. The potential difference across the entire tube was of the order of 100 volts, but the tubes employed were of such length, 30 to 100 cm., that the voltage drop per mean free path of an electron was quite small. The spectrum is strictly of the arc type, only a few of the more readily excited spark lines appearing, and these in comparatively low intensity.

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