The L emission spectra of lead and bismuth

Abstract
In a previous paper published by the authors which dealt with the L emission series of mercury, the wave-lengths of four lines were given the ν /R values of which corresponded with transitions between energy levels disallowed by the Bohr Selection Principle. In a further investigation, to discover if corresponding lines could be found in the L spectra of elements close to mercury in the Periodic Classification, the spectra of lead and bismuth were examined. In each case the corresponding four lines were found, and in addition several other “non-diagram” lines. The present paper gives a brief account of the results obtained. Several other investigators have found lines which correspond with transitions contrary to the Selection Principle. Dauvillier found many such in the L emission series of the heavy elements from ytterbium to gold, and Rogers in the spectra of tungsten and platinum. Crofutt also found several for tungsten, and the existence of a tungsten line γ 11 (L 3 N 4 ) has been confirmed by Dershem and by Overn.

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