We describe a ${}^3\mathrm{He}\text{−}{}^{129}\mathrm{Xe}$ comagnetometer using ${}^{87}\mathrm{Rb}$ atoms for noble-gas spin polarization and detection. We use a train of ${}^{87}\mathrm{Rb}$ $\pi$ pulses and ${\sigma }^{+}/{\sigma }^{-}$ optical pumping to realize a finite-field Rb magnetometer with suppression of spin-exchange relaxation. We suppress frequency shifts from polarized Rb by measuring the ${}^3\mathrm{He}$ and ${}^{129}\mathrm{Xe}$ spin precession frequencies in the dark, while applying $\pi$ pulses along two directions to depolarize Rb atoms. The plane of the $\pi$ pulses is rotated to suppress the Bloch-Siegert shifts for the nuclear spins. We measure the ratio of ${}^3\mathrm{He}$ to ${}^{129}\mathrm{Xe}$ spin precession frequencies with sufficient absolute accuracy to resolve Earth’s rotation without changing the orientation of the comagnetometer. A frequency resolution of 7 nHz is achieved after integration for 8 h without evidence of significant drift.

中文翻译：

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使用Rb87检测和去耦的He3-Xe129磁力计

我们描述一个 ${}^3他\text{-}{}^{129}e$ 磁力计使用 ${}^{87}b$原子用于稀有气体自旋极化和检测。我们用火车${}^{87}b$ $\pi$ 脉冲和 ${\sigma }^{+}/{\sigma }^{-}$光泵浦以实现具有自旋交换弛豫抑制作用的有限域Rb磁力计。我们通过测量${}^3他$ 和 ${}^{129}e$ 在应用时在黑暗中旋转进动频率 $\pi$沿两个方向发出脉冲使Rb原子去极化。的飞机$\pi$旋转脉冲以抑制核自旋的Bloch-Siegert位移。我们测量${}^3他$ 到 ${}^{129}e$自旋进动频率具有足够的绝对精度，可以解决地球的自转，而无需更改电磁仪的方向。积分8小时后，可获得7 nHz的频率分辨率，而没有明显的漂移迹象。