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arXiv 2210.01481physics.atom-phcond-mat.quant-gasphysics.chem-phphysics.optics
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铯原子$7d$ $^{2}D_{3/2}$态超精细分裂和交流斯塔克位移的高精度测量

High precision measurement of the hyperfine splitting and ac Stark shift of the $7d$ $^{2}D_{3/2}$ state in atomic cesium

Bubai Rahaman, Sourav Dutta

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14 pages, 7 figures, to appear in Physical Review A
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摘要：

我们报道了在铯蒸气室中用高分辨无多普勒双光子光谱测量$^{133}$ Cs的$7d$ $^{2}D_{3/2}$态的超精细分裂。我们确定的超精细耦合常数$A = 7.3509(9)$ MHz和$B = -0.041(8)$ MHz，这代表了一个数量级的精度提高。我们还得到的核磁八极耦合常数$C$的大小的界限。此外，我们测量了767.8 nm处的$6s$ $^{2}S_{1/2} \rightarrow 7d$ $^{2}D_{3/2}$跃迁的交流斯塔克位移为$-49 \pm 5$ Hz/（W/cm $^2$），与理论计算一致。我们进一步报告的测量碰撞位移[ $-32.6 \pm 2.0$ kHz/mTorr]和压力加宽的个人超精细水平的$6s$ $^{2}S_{1/2} \rightarrow 7d$ $^{2}D_{3/2}$过渡。这些测量结果为分析基于铯原子$6s$ $^{2}S_{1/2} \rightarrow 7d$ $^{2}D_{3/2}$双光子跃迁的光频标的系统效应提供了有价值的信息

英文摘要：

We report the measurement of hyperfine splitting in the $7d$ $^{2}D_{3/2}$ state of $^{133}$Cs using high resolution Doppler-free two-photon spectroscopy in a Cs vapor cell. We determine the hyperfine coupling constants $A = 7.3509(9)$ MHz and $B = -0.041(8)$ MHz, which represent an order of magnitude improvement in the precision. We also obtain bounds on the magnitude of the nuclear magnetic octupole coupling constant $C$. Additionally, we measure the ac Stark shift of the $6s$ $^{2}S_{1/2} \rightarrow 7d$ $^{2}D_{3/2}$ transition at 767.8 nm to be $-49 \pm 5$ Hz/(W/cm$^2$), in agreement with theoretical calculations. We further report the measurement of collisional shift [$-32.6 \pm 2.0$ kHz/mTorr] and pressure broadening for the individual hyperfine levels of the $6s$ $^{2}S_{1/2} \rightarrow 7d$ $^{2}D_{3/2}$ transition. These measurements provide valuable inputs for analysis of systematic effects in optical frequency standards based on the cesium $6s$ $^{2}S_{1/2} \rightarrow 7d$ $^{2}D_{3/2}$ two-photon transition

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