The K and L Absorption and Emission Spectra of Tungsten

Both the absorption and emission spectra were photographed simultaneously on the same plate, using a special float-operated mechanism to turn the crystal very slowly so as to obtain the faint lines between β₂ and β₅. The absorption wave-lengths were found to be: LA₁, 1.2122A; LA₂, 1.0716A; LA₃, 1.0217A; KA,.17802A. Table I gives the emission wave-lengths of 28 L emission lines including the four new lines β₁₅ (1.2432), β₁₆ (1.2166), γ₁₂ (1.0748) and n (1.0699), and of the Kβ₃ line (.18525) which is the line found by DeBroglie. Comparison with the Bohr theory. The agreement of the emission frequencies computed from the energy levels with the measured wave-lengths is better than 1/10 per cent, except for β₁₅ and β₁₆. The lines β₁₀, β₉, γ₁₂, and γ₁₁, however, correspond to transitions between energy levels which are not predicted by the selection principle, and lines β₈ and n are not in agreement with the accepted energy levels. While Ln may be due to an impurity, β₈ is probably a tungsten line.