Measurement and simulation of laser-induced fluorescence from nonequilibrium ultracold neutral plasmas
Measurement and simulation of laser-induced fluorescence from nonequilibrium ultracold neutral plasmas
复制标题
非平衡超冷中性等离子体激光诱导荧光的测量和模拟
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
F. Robicheaux
中科院分区：
文献类型：
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作者：
A. Denning;S. Bergeson;F. Robicheaux
我们报告了超冷中性等离子体中激光诱导荧光的新测量和模拟。我们关注最早的时间，当等离子体平衡正在演变，在等离子体膨胀之前。在模拟中，离子在具有包裹边界条件的小电池中通过汤川电位相互作用。我们求解了模拟中每个离子随时间的光学布洛赫方程。模拟和实验均显示了初始布洛赫矢量旋转、无序加热和rms离子速度的相干振荡。荧光信号的详细建模使得利用荧光光谱探测超冷和强耦合等离子体中的离子动力学成为可能。
We report new measurements and simulations of laser-induced fluorescence in ultracold neutral plasmas. We focus on the earliest times, when the plasma equilibrium is evolving and before the plasma expands. In the simulation, the ions interact via the Yukawa potential in a small cell with wrapped boundary conditions. We solve the optical Bloch equation for each ion in the simulation as a function of time. Both the simulation and experiment show the initial Bloch vector rotation, disorder-induced heating, and coherent oscillation of the rms ion velocity. Detailed modeling of the fluorescence signal makes it possible to use fluorescence spectroscopy to probe ion dynamics in ultracold and strongly coupled plasmas.