The role of negative hydroxyl ions in the electron generation and breakdown during plasma formation in liquid water
The role of negative hydroxyl ions in the electron generation and breakdown during plasma formation in liquid water
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液态水中等离子体形成过程中负羟基离子在电子产生和击穿中的作用
DOI：
10.1088/1361-6595/abfbc7
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Farouk, Tanvir
中科院分区：
文献类型：
--
作者：
Aghdam, Ali Charchi;Farouk, Tanvir
负氢氧离子在液相等离子体放电形成中的作用进行了研究，使用内部建模框架。电子的两个隧穿源被认为是水分子的隧穿电离和负氢氧根离子的隧穿脱离以及额外的反应步骤。模拟进行了两个不同的纳秒上升时间的电压曲线-线性和指数上升的针状供电电极。两种配置文件的最大电压均为15 kV。预测表明，电子脱离，它具有低得多的阈值能量要求，提供了一个在初始上升时间在低电压下的电子流。来自电子分离过程的电力在液体中产生更强的压缩但更弱的膨胀状态，导致密度增加约40%，仅减少约1%。发现电子脱离隧穿过程不受电场的限制，而是受系统中负氢氧根离子的可用性的限制，并且当这些离子耗尽时停止。水分子的隧道电离在更高的施加电压下形成电子波，但所得的峰值电子数密度通常比脱离隧穿大六个数量级。较高的电子数密度允许系统中耗尽的负氢氧根离子的再循环，并且可以重新建立隧穿脱离。此外，该系统经历了更大的密度变化;具体地说，由于隧道电离而导致密度降低。预测还表明，无论初始电子源（即隧道电离或隧道脱离）的减少电场是不够的，让电子碰撞电离是活跃的，并作出重大贡献。进行路径通量分析以确定负氢氧根离子再循环的动力学。
The role of negative hydroxyl ions in liquid-phase plasma discharge formation is investigated using an inhouse modeling framework. Two tunneling sources for electrons are considered—tunneling ionization of water molecules and tunneling detachment of negative hydroxyl ions together with additional reaction steps. The simulations are conducted for a needle-like powered electrode with two different nanosecond rise time voltage profiles—a linear and an exponential rise. Both the profiles have a maximum voltage of 15 kV. The predictions show that the electron detachment, which has a much lower threshold energy requirement, provides a stream of electrons at low applied voltage during the initial rise time. The electrical forces from the electron detachment process generate stronger compression but a weaker expansion regime in the liquid resulting in∼ 40% increase in the density and only∼ 1% decrease. The electron detachment tunneling process is found to be not limited by the electric field, but rather by the availability of negative hydroxyl ions in the system and ceases when these ions are depleted. The tunnel ionization of water molecules forms the electron wave at a higher applied voltage, but the resulting peak electron number density is typically six orders of magnitude larger than the detachment tunneling. The higher electron number density allows the recycling of depleted negative hydroxyl ions in the system and can reestablish tunneling detachment. In addition, the system experiences a larger variation in density; specifically, a decrease in density due to tunnel ionization. The prediction also shows that irrespective of the initial electron sources (ie tunnel ionization or tunnel detachment) the reduced electric field is not sufficient enough to allow electron impact ionization to be active and make a significant contribution. Path flux analysis is conducted to determine the kinetics responsible for the recycling of the negative hydroxyl ions.
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影响因子：
2.7
作者：
Gardner, David J.;Reynolds, Daniel R.;Balos, Cody J.
通讯作者：
Balos, Cody J.
DOI：
10.1063/1.168744
发表时间：
1998-11-01
期刊：
COMPUTERS IN PHYSICS
影响因子：
--
作者：
Weller, HG;Tabor, G;Fureby, C
通讯作者：
Fureby, C
液体中等离子体放电形成初始阶段的多物理场模拟
影响因子：
3.8
作者：
Aghdam, Ali Charchi;Farouk, Tanvir
通讯作者：
Farouk, Tanvir
液体电介质亚纳秒脉冲击穿初始阶段的理论研究
影响因子：
3.1
作者：
M. Shneider;M. Pekker;Alexander Fridman
通讯作者：
Alexander Fridman
非均匀脉冲电场中的液体电介质
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
M. Shneider
通讯作者：
M. Shneider