A 303-MHz frequency standard based on trapped Be/sup +/ ions
作者： J.J. Bollinger , D.J. Heizen , W.M. Itano , S.L. Gilbert , D.J. Wineland
关键词: Optical pumping 、 Ion trap 、 Ion 、 Penning trap 、 Physics 、 Laser cooling 、 Hyperfine structure 、 Frequency standard 、 Doppler effect 、 Atomic physics
摘要: A 303-MHz hyperfine transition in the ground state of 9Be+ was used as a basis frequency standard. The ions were stored Penning ion trap. Linewidths narrow 900μHz obtained. stability measured to be better than 3 x 10-12τ-1/2. inaccuracy second-order .Doppler shift reduced 5 parts 1015 by laser cooling. An apparent pressure with an unexpectedly large value discovered which limits accuracy current experiment approximately 1 part 1013.
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