使用原子磁力仪对超极化$^{13}$C核自旋进行实时偏振测量
Real-time polarimetry of hyperpolarized $^{13}$C nuclear spins using an atomic magnetometer
AI总结：
提出一种利用高灵敏度$^{87}$Rb蒸气磁力仪非破坏性量化核自旋极化的方法，通过加窗动态退耦脉冲序列延长寿命并调制极化，实现对超极化[1--$^{13}$C]-丙酮酸溶液的实时质量监测。
摘要：
我们介绍了一种非破坏性量化核自旋极化的方法，该方法与从光谱学到体内成像的磁共振中广泛使用的超极化自旋示踪剂相关。在约30 nT的偏置场中，我们使用高灵敏度微型$^{87}$Rb蒸气磁力仪测量样品产生的场，同时样品由加窗动态退耦脉冲序列驱动，该序列既最大化核自旋寿命，又调制极化以便于检测。我们展示了该方法应用于由溶解动态核极化产生的0.08 M超极化[1--$^{13}$C]-丙酮酸溶液，在地球场中自然衰变期间反复测量极化。讨论了在超极化物质实时质量监测中的应用。
英文摘要：
We introduce a method for non-destructive quantification of nuclear spin polarization, of relevance to hyperpolarized spin tracers widely used in magnetic resonance from spectroscopy to in vivo imaging. In a bias field of around 30 nT we use a high-sensitivity miniaturized $^{87}$Rb vapor magnetometer to measure the field generated by the sample, as it is driven by a windowed dynamical decoupling pulse sequence that both maximizes the nuclear spin lifetime and modulates the polarization for easy detection. We demonstrate the procedure applied to a 0.08 M hyperpolarized [1--$^{13}$C]-pyruvate solution produced by dissolution dynamic nuclear polarization, measuring polarization repeatedly during natural decay at Earth's field. Application to real-time quality monitoring of hyperpolarized substances is discussed.
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