Frequency metrology on the 4s(2)S(1/2)-4p(2)P(1/2) transition in Ca-40(+) for a comparison with quasar data
Frequency metrology on the 4s(2)S(1/2)-4p(2)P(1/2) transition in Ca-40(+) for a comparison with quasar data
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Ca-40( ) 中 4s(2)S(1/2)-4p(2)P(1/2) 跃迁的频率计量，用于与类星体数据进行比较
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
K. Eikema
中科院分区：
文献类型：
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作者：
A. Wolf;S. V. D. Berg;C. Gohle;E. Salumbides;W. Ubachs;K. Eikema
利用线性Paul陷阱中的激光冷却和结晶离子，对钙离子的4s S-2(1/2)-4p P-2(1/2)跃迁进行了高精度的频率测量。使用频率梳激光器进行校准，得到的过渡频率为f=755222 766.2(1.7)MHz。精度提高了一个数量级以上，并将有助于与类星体数据进行比较，以寻找宇宙时间尺度上精细结构常数可能的变化。
High accuracy frequency metrology on the 4s S-2(1/2)-4p P-2(1/2) transition in calcium ions is performed using laser cooled and crystallized ions in a linear Paul trap. Calibration is performed with a frequency comb laser, resulting in a transition frequency of f = 755 222 766.2 (1.7) MHz. The accuracy presents an improvement of more than one order of magnitude, and will facilitate a comparison with quasar data in a search for a possible change of the fine structure constant on a cosmological time scale.