KSeries X-Ray Wavelengths in Rare Earth Elements

The $K$-series x-rays in ten rare earth elements have been studied with a two-meter-radius bent-quartz-crystal spectrograph. The 3.7-Mev proton beam of the A-48 accelerator (UCRL, Livermore) was used to produce the atomic excitations. The wavelengths obtained for the $K_{\alpha 1}$, $K_{\alpha 2}$, $K_{\beta 3}$, and $K_{\beta 1}$ lines are compared with previous wavelength measurements. Two weaker transitions, $K_{\beta 5}$ and $K{O}_{\mathrm{II}}{O}_{\mathrm{III}}$, were also observed and the energies are compared with energies obtained from tables of known atomic energy levels.