Wineland D J, Bergquist J C, Bollinger J J, Itano W M, Heinzen D J, Gilbert S L, Manney C H, Raizen M G
Nat. Inst. of Stand. and Technol., Boulder, CO.
IEEE Trans Ultrason Ferroelectr Freq Control. 1990;37(6):515-23. doi: 10.1109/58.63107.
Experiments directed toward the realization of frequency standards of high accuracy using stored ions are briefly summarized. In one experiment, an RF oscillator is locked to a nuclear spin-flip hyperfine transition (frequency approximately 3.03x10(8) Hz) in (9 )Be(+) ions that are stored in a Penning trap and sympathetically laser-cooled. Stability is better than 3x10(-12)tau(-(1/2)) and uncertainty in Doppler shifts is estimated to be less than 5x10(-15). In a second experiment, a stable laser is used to probe an electric quadrupole transition (frequency approximately 1.07x10(15) Hz) in a single laser-cooled (199)Hg(+) ion stored in a Paul trap. The measured Q value of this transition is approximately 10(13). Future possible experiments are discussed.
简要总结了利用存储离子实现高精度频率标准的实验。在一个实验中，射频振荡器被锁定到存储在潘宁阱中并通过交感激光冷却的(9 )Be(+)离子的核自旋翻转超精细跃迁（频率约为3.03x10(8) Hz）。稳定性优于3x10(-12)tau(-(1/2))，多普勒频移的不确定性估计小于5x10(-15)。在第二个实验中，使用稳定的激光探测存储在保罗阱中的单个激光冷却的(199)Hg(+)离子的电四极跃迁（频率约为1.07x10(15) Hz）。该跃迁的测量Q值约为10(13)。还讨论了未来可能进行的实验。
