Beiersdorfer P, Chen H, Thorn D B, Träbert E
Department of Physics and Advanced Technologies, Lawrence Livermore National Laboratory, Livermore, California 94550-9234, USA.
Phys Rev Lett. 2005 Dec 2;95(23):233003. doi: 10.1103/PhysRevLett.95.233003. Epub 2005 Dec 1.
Using the SuperEBIT electron beam ion trap, we have measured the 2s(1/2)-2p(1/2) transitions in U88+ and U89+. The measured value of 280.645 +/- 0.015 eV for Li-like U89+ improves the available precision by nearly an order of magnitude and establishes a new benchmark for testing the total QED contribution to the transition energy within a fractional accuracy of 3.6 x 10(-4). We infer a value for the 2s two-loop Lamb shift in U89+ of -0.23 eV, from which we estimate a value of -1.27 eV for the 1s two-loop Lamb shift in U91+.
利用超级电子束离子阱，我们测量了U88 +和U89 +中的2s(1/2)-2p(1/2)跃迁。类锂U89 +的测量值为280.645±0.015电子伏特，将可用精度提高了近一个数量级，并建立了一个新的基准，用于在3.6×10(-4)的分数精度内测试量子电动力学对跃迁能量的总贡献。我们推断U89 +中2s双圈兰姆位移的值为-0.23电子伏特，据此我们估计U91 +中1s双圈兰姆位移的值为-1.27电子伏特。
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