GREMI, Groupe de Recherches sur l'Energétique des Milieux Ionisés, UMR7344 CNRS/Université d'Orléans, 14 rue d'Issoudun, BP6744, 45067 Orléans Cedex 2, France.
Phys Rev Lett. 2012 Dec 14;109(24):245007. doi: 10.1103/PhysRevLett.109.245007.
Dust particle growth in a plasma is a strongly disturbing phenomenon for the plasma equilibrium. It can induce many different types of low-frequency instabilities that can be experimentally observed, especially using high-speed imaging. A spectacular case has been observed in a krypton plasma where a huge density of dust particles is grown by material sputtering. The instability consists of well-defined regions of enhanced optical emission that emerge from the electrode vicinity and propagate towards the discharge center. These plasma spheroids have complex motions resulting from their mutual interaction that can also lead to the merging of two plasma spheroids into a single one. The reverse situation is also observed with the splitting of a plasma spheroid into two parts. These results are presented for the first time and reveal new behaviors in dusty plasmas.
尘埃颗粒在等离子体中的生长是对等离子体平衡的强烈干扰现象。它可以诱导许多不同类型的低频不稳定性，这些不稳定性可以通过实验观察到，特别是使用高速成像。在氪等离子体中观察到了一个引人注目的例子，其中通过材料溅射生长了大量的尘埃颗粒。这种不稳定性由从电极附近出现并向放电中心传播的增强光学发射的明确定义区域组成。这些等离子体球体由于相互作用而产生复杂的运动，这也可能导致两个等离子体球体合并成一个球体。相反的情况也观察到，即一个等离子体球体分裂成两个部分。这些结果是首次提出的，揭示了尘埃等离子体中的新行为。
