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arXiv physics/0611134physics.atom-ph
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~(43)Ca ~(++)S1/2-D5/2跃迁超精细结构的测量

Measurement of the hyperfine structure of the S1/2-D5/2 transition in 43Ca+

J. Benhelm, G. Kirchmair, U. Rapol, T. Koerber, C. F. Roos, R. Blatt

摘要:

用激光光谱法研究了~(43)Ca ~(++)在729 nm处S_(1/2)-D_(5/2)四极跃迁的超精细结构。确定了亚稳能级的超精细结构常数A=-3.8931(2)MHz,B=-4.241(4)MHz。测得该跃迁相对于~(40)Ca ~+的同位素位移为4134.713(5)MHz。我们证明了在非零低磁场下存在独立于一阶塞曼位移的跃迁。这些跃迁可能比众所周知的零磁场下m=0电平之间的“时钟跃迁”更适合于建立频率标准。

英文摘要:

The hyperfine structure of the S1/2-D5/2 quadrupole transition at 729 nm in 43Ca+ has been investigated by laser spectroscopy using a single trapped 43Ca+ ion. We determine the hyperfine structure constants of the metastable level as A=-3.8931(2) MHz and B=-4.241(4) MHz. The isotope shift of the transition with respect to 40Ca+ was measured to be 4134.713(5) MHz. We demonstrate the existence of transitions that become independent of the first-order Zeeman shift at non-zero low magnetic fields. These transitions might be better suited for building a frequency standard than the well-known 'clock transitions' between m=0 levels at zero magnetic field.

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