Precision measurement of theKα transitions in heliumlikeGe30+

A measurement of the 1s2p ${}_{}{}^1{}_{}{}^{}$ ${\mathit{P}}_1$→1${\mathit{s}}^2$ ${}_{}{}^1{}_{}{}^{}$ ${\mathit{S}}_0$ resonance transition in heliumlike germanium (${\mathrm{Ge}}^{30+}$) has been made on the Lawrence Livermore National Laboratory electron-beam ion trap to a precision of 21 ppm. The result is compared with theoretical values and confirms a trend previously seen in the differences between experiment and theory for this transition as a function of Z. Results for the 1s2p ${}_{}{}^3{}_{}{}^{}$ ${\mathit{P}}_1$→1${\mathit{s}}^2$ ${}_{}{}^1{}_{}{}^{}$ ${\mathit{S}}_0$ and 1s2p ${}_{}{}^3{}_{}{}^{}$ ${\mathit{P}}_2$→1${\mathit{s}}^2$ ${}_{}{}^1{}_{}{}^{}$ ${\mathit{S}}_0$ intercombination lines and for the 1s2s ${}_{}{}^3{}_{}{}^{}$ ${\mathit{S}}_1$→1${\mathit{s}}^2$ ${}_{}{}^1{}_{}{}^{}$ ${\mathit{S}}_0$ forbidden line are also presented and show similar differences with theoretical predictions.