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arXiv 1302.4162physics.atom-ph
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氘气中~(87)Rb和~(133)Cs原子的超精细频率

Hyperfine frequencies of 87Rb and 133Cs atoms in Xe gas

B. H. McGuyer, T. Xia, W. Happer

摘要:

基态~(87)Rb和~(133)Cs原子的微波共振频率与压强的非线性关系很大,这可能是由于Rb和Cs的范德华分子的作用.尽管三种气体的线性位移都是负的,但Ar和Kr的非线性位移的符号与先前测量的Ar和Kr的位移相反。实验数据显示出与以前的非线性位移理论的显著差异。除了分子中的超精细位移相互作用之外,通过考虑自旋-旋转相互作用,消除了大部分这种差异。在我们的实验精度的限制下,87 Rb和133 Cs在He,Ne和N2中的位移与压力呈线性关系。

英文摘要:

The microwave resonant frequencies of ground-state 87Rb and 133Cs atoms in Xe buffer gas are shown to have a relatively large nonlinear dependence on the Xe pressure, presumably because of RbXe or CsXe van der Waals molecules. The nonlinear shifts for Xe are opposite in sign to the previously measured shifts for Ar and Kr, even though all three gases have negative linear shifts. The Xe data show striking discrepancies with the previous theory for nonlinear shifts. Most of this discrepancy is eliminated by accounting for the spin-rotation interaction in addition to the hyperfine-shift interaction in the molecules. To the limit of our experimental accuracy, the shifts of 87Rb and 133Cs in He, Ne, and N2 were linear with pressure.

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