Measurements of the Kα transition energies of heliumlike krypton

Measurements of the 1s2p(1)P(1)-->1s(21)S(0), 1s2p(3)P(2)-->1s(21)S(0), 1s2p(3)P(1)-->1s(21)S(0), and 1s2s(3)S(1)-->1s(21)S(0) transitions in heliumlike krypton (Kr34+) have been made on the Electron Beam Ion Trap (EBIT) facility at the Lawrence Livermore National Laboratory. The measurements were performed using a high-resolution crystal spectrometer and an accuracy of about 30 ppm was achieved. Unlike earlier measurements, our results are in good agreement with recent theoretical predictions.