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The K and L Absorption and Emission Spectra of Tungsten

1924; American Institute of Physics; Volume: 24; Issue: 1 Linguagem: Inglês

10.1103/physrev.24.9

1536-6065

C. B. Crofutt,

Electron and X-Ray Spectroscopy Techniques

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 ${\ensuremath{\beta}}_{2}$ and ${\ensuremath{\beta}}_{5}$. The absorption wave-lengths were found to be: L${\mathrm{A}}_{1}$, 1.2122A; L${\mathrm{A}}_{2}$, 1.0716A; L${\mathrm{A}}_{3}$, 1.0217A; KA,.17802A. Table I gives the emission wave-lengths of 28 L emission lines including the four new lines ${\ensuremath{\beta}}_{15}$ (1.2432), ${\ensuremath{\beta}}_{16}$ (1.2166), ${\ensuremath{\gamma}}_{12}$ (1.0748) and n (1.0699), and of the $\mathrm{K}{\ensuremath{\beta}}_{3}$ 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 ${\ensuremath{\beta}}_{15}$ and ${\ensuremath{\beta}}_{16}$. The lines ${\ensuremath{\beta}}_{10}$, ${\ensuremath{\beta}}_{9}$, ${\ensuremath{\gamma}}_{12}$, and ${\ensuremath{\gamma}}_{11}$, however, correspond to transitions between energy levels which are not predicted by the selection principle, and lines ${\ensuremath{\beta}}_{8}$ and n are not in agreement with the accepted energy levels. While Ln may be due to an impurity, ${\ensuremath{\beta}}_{8}$ is probably a tungsten line.