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arXiv 1607.01799physics.atom-ph
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用两步原子束光谱法测量铟$6p_{1/2}$态的标量极化率

Measurement of the scalar polarizability of the indium $6p_{1/2}$ state using two-step atomic-beam spectroscopy

Benjamin L. Augenbraun, Allison Carter, P. M. Rupasinghe, P. K. Majumder

备注：
9 pages, 10 figures
发表信息：
Phys. Rev. A 94, 022515 (2016)
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摘要：

我们用两步激光光谱法在铟原子束中测量了$^{115}$ In $6s_{1/2} \rightarrow 6p_{1/2}$激发态跃迁的斯塔克位移。结合这一测量与最近的实验结果，我们确定的标量极化率，$α_{0}$的$6p_{1/2}$状态是$7683 \pm43 \,a_{0}^{3}$的原子单位，一个结果，这与最近的理论计算非常吻合。在这个实验中，一束激光，稳定到$5p_{1/2} \rightarrow 6s_{1/2}$ 410 nm跃迁，被横向引导到原子束，而另一束重叠的激光扫描穿过1343 nm $6s_{1/2} \rightarrow 6p_{1/2}$跃迁。我们利用红外激光束的双音频率调制光谱来测量相互作用区域中的第二步吸收，其中光学深度小于10 $^{-3}$。在我们的实验工作过程中，我们还确定了$6p_{1/2}$状态内的超精细分裂，提高了现有测量的精度。

英文摘要：

We have completed a measurement of the Stark shift within the $^{115}$In $6s_{1/2} \rightarrow 6p_{1/2}$ excited-state transition using two-step laser spectroscopy in an indium atomic beam. Combining this measurement with recent experimental results we determine the scalar polarizability, $α_{0}$, of the $6p_{1/2}$ state to be $7683 \pm43 \,a_{0}^{3}$ in atomic units, a result which agrees very well with recent theoretical calculations. In this experiment, one laser, stabilized to the $5p_{1/2} \rightarrow 6s_{1/2}$ 410~nm transition, was directed transversely to the atomic beam, while a second, overlapping laser was scanned across the 1343~nm $6s_{1/2} \rightarrow 6p_{1/2}$ transition. We utilized two-tone frequency-modulation spectroscopy of the infrared laser beam to measure the second-step absorption in the interaction region, where the optical depth is less than 10$^{-3}$. In the course of our experimental work we also determined the hyperfine splitting within the $6p_{1/2}$ state, improving upon the precision of an existing measurement.

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