Itano W M
National Institute of Standards and Technology, Boulder, CO 80305.
J Res Natl Inst Stand Technol. 2000 Dec 1;105(6):829-37. doi: 10.6028/jres.105.065. Print 2000 Nov-Dec.
Frequency shifts of the (199)Hg(+) 5d (10)6s (2)S1/2 (F = 0, MF = 0) to 5d (9)6s (2 2)D5/2 (F = 2, MF = 0) electric-quadrupole transition at 282 nm due to external fields are calculated, based on a combination of measured atomic parameters and ab initio calculations. This transition is under investigation as an optical frequency standard. The perturbations calculated are the quadratic Zeeman shift, the scalar and tensor quadratic Stark shifts, and the interaction between an external electric field gradient and the atomic quadrupole moment. The quadrupole shift is likely to be the most difficult to evaluate in a frequency standard and may have a magnitude of about 1 Hz for a single ion in a Paul trap.
基于测量的原子参数和从头计算相结合的方法,计算了由于外部场导致的(199)Hg(+)在282nm处从5d(10)6s(2)S1/2(F = 0,MF = 0)到5d(9)6s(2 2)D5/2(F = 2,MF = 0)电四极跃迁的频移。该跃迁作为一种光频标准正在研究中。计算的微扰包括二次塞曼频移、标量和张量二次斯塔克频移,以及外部电场梯度与原子四极矩之间的相互作用。四极频移在频率标准中可能最难评估,对于保罗阱中的单个离子,其大小可能约为1Hz。