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

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±0.03 Å, 2$s^2$ ${}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{}$–2s2p ${}_{}{}^3{}_{}{}^{}\mathrm{P}_1^{}{}_{}{}^{}$ 137.787±0.03 Å for Mo x x x i x, and 2s ${}_{}{}^2{}_{}{}^{}\mathrm{S}_{1/2}^{}{}_{}{}^{}$–2p ${}_{}{}^2{}_{}{}^{}\mathrm{P}_{1/2}^{}{}_{}{}^{}$ 143.998±0.02 Å, 2s ${}_{}{}^2{}_{}{}^{}\mathrm{S}_{1/2}^{}{}_{}{}^{}$–2p ${}_{}{}^2{}_{}{}^{}\mathrm{P}_{3/2}^{}{}_{}{}^{}$ 58.499±0.02 Å for Mo x l. For the berylliumlike ion the results are compared with the semiempirical predictions by Edlén [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)].