New X-Ray Line γ₆ for Elements Tantalum to Uranium.---The two emission lines γ₂ and γ₄ are found to be in reality three lines. The new line γ₆ has wave-lengths of 1110, 1072, 842, 630 and 593 ×{} 10^-11 cm. for Ta, W, Tl, Th and U respectively. In the cases of Ir, Pt and Au it is too near γ₂ and in the cases of Pb and Bi too near γ₃ to be separated.New Absorption Lines of the M-series.---Ma₁, Ma₂ and Ma₃ have been measured for bismuth, and Ma₄ and Ma₅ for thorium and uranium, the wave-lengths being, respectively, 4762, 4569, 3894, 2571, 2388, 2385 and 2228 ×{} 10^-11 cm.Identification of the Line for Tantalum and Tungsten.---For all the elements Os to U, the difference in wave-lengths of β₂-β₅ is equal to about 29 ×{} 10^-11 cm. If this difference is the same for Ta and W also, the β₅ lines for these elements must be the lines 1220.8 and 1250.6, respectively, instead of those ordinarily assumed.Measurement of La, and La₂ for Tungsten by a different method gave the same wave-lengths as those found by Duane and Patterson.Relationships between Emission and Absorption X-Ray Spectra.---(1) Stokes's law seemed not to hold in the case of W. It was thought the apparent discrepancies might be due to an error in the measurement of La₁ and La₂, but these measurements were found correct; however, the discrepancies disappear if we identify β₅ with 1220.8 instead of 1212.5 and if we associate γ₂ and γ₃ with La₃ and the new line γ₆ with La₂. (2) Relations between frequencies. The frequencies of seven of the L-series lines are each approximately equal to the difference between the frequency of an La-line and that of an Ma-line.
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D. Coster (1922) studied this question.