Charging of spinning insulating ob jects by plasma and photoemission

Charging of insulating and conducting dust grains by flowing plasma and photoemission

The charging of conducting or alternatively insulating dust grains in a supersonic plasma flow with a directed photon flux is studied by the particle-in-cell method. The electron emission modifies the surface charge distribution on a grain and in the surrounding plasma. The charge and potential distributions on and around a dust grain are studied for different photon fluxes and different angles of the incident unidirectional photons with respect to the plasma flow velocity vector. Continuous and pulsed radiations are considered. We show that photoemission allows controlling the charge on condu…

Charging of Aggregate Grains in Astrophysical Environments

The charging of dust grains in astrophysical environments has been investigated with the assumption these grains are homogeneous spheres. However, there is evidence which suggests many grains in astrophysical environments are irregularly-shaped aggregates. Recent studies have shown that aggregates acquire higher charge-to-mass ratios due to their complex structures, which in turn may alter their subsequent dynamics and evolution. In this paper, the charging of aggregates is examined including secondary electron emission and photoemission in addition to primary plasma currents. The results show…

负电介质基底的激光诱导电子光脱附

Laser-stimulated photodetachment of electrons from the negatively charged dielectric substrates

本研究通过实验发现电介质表面等离子体诱导多余电子的激光光脱附产额与材料表列电子亲和能无关，仅取决于初始表面电荷密度，该结果对等离子体相关多领域研究具有关键意义。

日球层中星际尘埃粒子的动力学充电

Dynamical charging of interstellar dust particles in the heliosphere

本文模拟了星际尘埃穿过日球层界面时的充电过程，比较稳态假设与动力学充电计算，发现大颗粒可近似稳态，而10 nm小颗粒需动力学处理，且其数密度分布沿日球层顶更加拉长。