Bistable intrinsic charge fluctuations of a dust grain subject to secondary electron emission in a plasma
Bistable intrinsic charge fluctuations of a dust grain subject to secondary electron emission in a plasma
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等离子体中二次电子发射的尘埃颗粒的双稳态固有电荷波动
DOI：
10.1103/physreve.92.043101
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发表时间：
2015
影响因子：
2.4
通讯作者：
Shotorban, B.
中科院分区：
文献类型：
--
作者：
Shotorban, B.
建立了一个主方程来研究等离子体中颗粒的本征电荷涨落，因为离子和初级电子通过碰撞收集附着在颗粒上，二次电子从颗粒中发射出来。考虑了麦克斯韦分布和非麦克斯韦分布两种不同的等离子体。当存在二次电子发射时，两个等离子体中的涨落都可以是双稳的，因为可能存在两个稳定的宏态，它们与电荷净电流的两个稳定根有关。涨落的亚稳性，表现为谷物电荷在两个宏观状态之间的传递，被证明是可能的。
A master equation was formulated to study intrinsic charge fluctuations of a grain in a plasma as ions and primary electrons are attached to the grain through collisional collection, and secondary electrons are emitted from the grain. Two different plasmas with Maxwellian and non-Maxwellian distributions were considered. The fluctuations could be bistable in either plasma when the secondary electron emission is present, as two stable macrostates, associated with two stable roots of the charge net current, may exist. Metastablity of fluctuations, manifested by the passage of the grain charge between two macrostates, was shown to be possible.