论文标题
强库仑耦合影响大气压等离子体中的离子和中性温度
Strong Coulomb Coupling Influences Ion and Neutral Temperatures in Atmospheric Pressure Plasmas
论文作者
论文摘要
分子动力学模拟用于在不同电离级分的部分大气压力等离子体中对离子和中性温度演变进行建模。结果表明，离子离子相互作用在电离级分处强烈耦合至10^-5，并且温度演化受与强耦合相关的影响的影响。具体而言，在离子化脉冲后，发现在离子等离子体周期（〜10S PS）的时间尺度上发现无序诱导的加热可以迅速加热离子。接下来是离子和中性的碰撞松弛，这会冷却离子并在更长（〜ns）的时间尺度上加热中性。然后由于离子中性的三体重组而导致的时间更长（〜100s ns）的时间尺度发生了较长的加热。开发了与仿真结果一致的温度演化的分析模型。一个结论是，强耦合效应在大气压等离子体中很重要。
Molecular dynamics simulations are used to model ion and neutral temperature evolution in partially-ionized atmospheric pressure plasma at different ionization fractions. Results show that ion-ion interactions are strongly coupled at ionization fractions as low as 10^-5 and that the temperature evolution is influenced by effects associated with the strong coupling. Specifically, disorder-induced heating is found to rapidly heat ions on a timescale of the ion plasma period (~10s ps) after an ionization pulse. This is followed by the collisional relaxation of ions and neutrals, which cools ions and heats neutrals on a longer (~ns) timescale. Slight heating then occurs over a much longer (~ 100s ns) timescale due to ion-neutral three-body recombination. An analytic model of the temperature evolution is developed that agrees with the simulation results. A conclusion is that strong coupling effects are important in atmospheric pressure plasmas.
