Experiments on Collisional Grain Charging of Micron-sized Preplanetary Dust
Experiments on Collisional Grain Charging of Micron-sized Preplanetary Dust
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DOI：
10.1086/308631
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发表时间：
2000-04
期刊：
影响因子：
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通讯作者：
T. Poppe;J. Blum;T. Henning
中科院分区：
文献类型：
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作者：
T. Poppe;J. Blum;T. Henning
微米级颗粒与速度高达几十m s-1的较大天体的碰撞被认为是太阳星云中与行星际尘埃聚集有关的重要物理过程。已有的碰撞实验表明，微米级颗粒与靶的碰撞具有明显的静电效应。其中包括观察粒子在机械反弹后返回目标并最终粘住，以及观察粒子在目标上的沉积受导电材料的影响。因此，很明显，尘埃聚集过程不能充分描述没有调查碰撞颗粒充电实验。我们目前的实验上的碰撞颗粒充电的微米级的颗粒撞击目标表面，与以前的工作相比，包括非导电材料和实验，涉及比以前更小的颗粒。碰撞颗粒充电比以前讨论的行星前颗粒更强，应该考虑行星前尘埃聚集，太阳星云中闪电的形成，以及带电颗粒与磁场的耦合。
Collisions between micron-sized grains and larger objects with velocities up to several 10 m s-1 are believed to be an important physical process in the solar nebula with respect to the preplanetary dust aggregation. Former collision experiments demonstrated that grain-target collisions of micron-sized particles were marked by obvious electrostatic effects. Among those were the observation of particles which, after mechanical rebound, returned to the target and finally stuck, and of particle deposition on targets influenced by the presence of conducting materials. Therefore, it is clear that the dust aggregation process cannot adequately be described without investigating collisional grain charging experimentally. We present experiments on the collisional grain charging of micron-sized grains impacting target surfaces which, in contrast to former work, consist both of nonconducting material and the experiments involving smaller particles than before. Collisional grain charging is stronger than previously discussed with respect to preplanetary grains and should be considered concerning the preplanetary dust aggregation, the formation of lightning in the solar nebula, and a coupling of charged grains to magnetic fields.