Photoassociation spectroscopy of laser-cooled ytterbium atoms.
Photoassociation spectroscopy of laser-cooled ytterbium atoms.
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DOI：
10.1103/physrevlett.93.123202
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发表时间：
2004-09
影响因子：
8.6
通讯作者：
Y. Takasu;K. Komori;K. Honda;M. Kumakura;T. Yabuzaki;Y. Takahashi
中科院分区：
文献类型：
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作者：
Y. Takasu;K. Komori;K. Honda;M. Kumakura;T. Yabuzaki;Y. Takahashi
报道了激光冷却镱原子在光阱中的光缔合光谱。我们观察到超过90个光缔合共振的振动能级在（1）西格玛（+）（u）状态，包括80个连续的系列，高达490 GHz的原子共振失谐。从共振频率我们推导出（6s 6p）1 P1态的原子辐射寿命为5.464+/-0.005 ns，这比以前的结果提高了大约2个数量级。我们还观察到的共振线加宽，这是归因于预解离的三重态，并估计跃迁概率为0.2。此外，我们观察到的光缔合信号强度的减少，从该散射长度估计是等于或小于3 nm。
We report the photoassociation spectroscopy of laser-cooled ytterbium atoms in an optical trap. We observed more than 90 photoassociation resonances of vibrational levels in the (1)Sigma(+)(u) state, including 80 consecutive series, up to 490 GHz detuning with respect to the atomic resonance. From the resonance frequencies we derived the atomic radiative lifetime of the (6s6p) 1P1 state to be 5.464+/-0.005 ns, which is about 2 orders of magnitude improvement over previous results. We also observed line broadening of resonances, which is ascribed to the predissociation to the triplet states, and estimated the transition probability to be 0.2. Furthermore, we observed the decrease of the photoassociation signal intensity, from which the scattering length is estimated to be equal to or less than 3 nm.