Many-body collision contributions to electron momentum damping rates in a plasma influenced by electron strong coupling
Many-body collision contributions to electron momentum damping rates in a plasma influenced by electron strong coupling
复制标题
受电子强耦合影响的多体碰撞对等离子体中电子动量阻尼率的贡献
作者：
Puchang Jiang;J. Guthrie;J. Roberts
通过测量电子等离子体振荡阻尼速率，可以对超冷中性等离子体中电子-离子碰撞速率进行实验研究。在足够冷和密集的条件下，强耦合影响很重要，测量的阻尼率比理论预期快37% [W]。Chen， C. Witte和J. Roberts，物理学家。[j].中国生物医学工程学报，2016,(5):391 - 391。我们进行了一系列数值模拟，以找出造成这种差异的主要原因。通过分析分子动力学模拟中由于碰撞引起的电子速度变化的分布，检查这种模拟中具有高偏转角的电子的轨迹，以及检查两体与三体电子-离子碰撞率比变化时的振荡阻尼率，我们发现这种差异与多体碰撞导致束缚电子的效应一致。除了电子振荡阻尼外，这对其他与电子-离子碰撞相关的输运性质也有影响。
Experimental studies of electron-ion collision rates in an ultracold neutral plasma (UNP) can be conducted through measuring the rate of electron plasma oscillation damping. For sufficiently cold and dense conditions where strong coupling influences are important, the measured damping rate was faster by 37\% than theoretical expectations [W. Chen, C. Witte, and J. Roberts, Phys. Rev. E extbf{96}, 013203 (2017)]. We have conducted a series of numerical simulations to isolate the primary source of this difference. By analyzing the distribution of electron velocity changes due to collisions in a molecular dynamics simulation, examining the trajectory of electrons with high deflection angle in such simulations, and examining the oscillation damping rate while varying the ratio of two-body to three-body electron-ion collision rates, we have found that the difference is consistent with the effect due to many-body collisions leading to bound electrons. This has implications for other electron-ion collision related transport properties in addition to electron oscillation damping.