Laser-induced-fluorescence imaging of a spin-polarized ultracold neutral plasma in a magnetic field
Laser-induced-fluorescence imaging of a spin-polarized ultracold neutral plasma in a magnetic field
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DOI：
10.1103/physreva.105.013108
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发表时间：
2022-01
影响因子：
2.9
通讯作者：
G. Gorman;M. Warrens;S. Bradshaw;T. Killian
中科院分区：
文献类型：
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作者：
G. Gorman;M. Warrens;S. Bradshaw;T. Killian
我们报告了磁场中超冷中性等离子体的多普勒敏感激光诱导荧光（LIF）成像。局部值的离子密度，流体动力学流体速度，温度和自旋极化的荧光模型的基础上获得的速度分辨速率方程（RE），包括由于激光耦合和自发辐射的状态之间的离子转移。的RE方法捕获光泵的离子到状态，不驱动的LIF激发激光，这是验证与实验数据。结合分子动力学和量子轨道模拟验证，速度变化的碰撞有一个可以忽略不计的影响，对典型的实验条件下的状态人口演变。的LIF光谱的塞曼分量的相对强度提供了明确的证据，离子是电子自旋极化时，通过光电离的磁陷阱原子。这个探头打开了许多可能性，研究热输运和中性等离子体的平衡在重叠制度的强耦合和磁化。
We report Doppler-sensitive laser-induced-fluorescence (LIF) imaging of an ultracold neutral plasma in a magnetic field. Local values of ion density, hydrodynamic fluid velocity, temperature, and spin polarization are obtained using a fluorescence model based on velocity-resolved rate equations (REs) including the transfer of ions between states due to laser coupling and spontaneous emission. The RE approach captures optical pumping of ions into states that are not driven by the LIF excitation laser, and this is validated with experimental data. Combined molecular-dynamics and quantum-trajectories simulations verify that velocity-changing collisions have a negligible impact on the state population evolution for typical experimental conditions. Relative intensities of Zeeman components of the LIF spectra provide clear evidence that the ions are electron-spin-polarized when created by photoionization of magnetically trappedatoms. This probe opens many possibilities for studying thermal transport and the equilibration of neutral plasmas in overlapping regimes of strong coupling and magnetization.