Berylliumlike Mo xxxix and lithiumlike Mo xl observed in the Joint European Torus tokamak

Abstract

The resonance lines of berylliumlike and lithiumlike molybdenum have been observed in high-temperature Joint European Torus tokamak discharges into which molybdenum was introduced using the laser blow-off method. The measured transition wavelengths are 2${s}^{2\mathrm{}1}$${S}_{0}$--2s2p $^{1}\mathrm{P}_{1}$ 49.904\ifmmode\pm\else\textpm\fi{}0.03 A\r{}, 2${s}^{2}$ $^{1}S_{0}$--2s2p $^{3}\mathrm{P}_{1}$ 137.787\ifmmode\pm\else\textpm\fi{}0.03 A\r{} for Mo xxxix, and 2s $^{2}\mathrm{S}_{1/2}$--2p $^{2}\mathrm{P}_{1/2}$ 143.998\ifmmode\pm\else\textpm\fi{}0.02 A\r{}, 2s $^{2}\mathrm{S}_{1/2}$--2p $^{2}\mathrm{P}_{3/2}$ 58.499\ifmmode\pm\else\textpm\fi{}0.02 A\r{} for Mo xl. For the berylliumlike ion the results are compared with the semiempirical predictions by Edl\'en [Phys. Scr. 28, 51 (1983)], while the results for lithiumlike Mo are compared with the calculations by Johnson, Blundell, and Sapirstein [Phys. Rev. A 37, 2764 (1988)].