Abstract
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 and . The absorption wave-lengths were found to be: L, 1.2122A; L, 1.0716A; L, 1.0217A; KA,.17802A. Table I gives the emission wave-lengths of 28 L emission lines including the four new lines (1.2432), (1.2166), (1.0748) and n (1.0699), and of the 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 and . The lines , , , and , however, correspond to transitions between energy levels which are not predicted by the selection principle, and lines and n are not in agreement with the accepted energy levels. While Ln may be due to an impurity, is probably a tungsten line.
- Received 27 February 1924
DOI:https://doi.org/10.1103/PhysRev.24.9
©1924 American Physical Society