Transition from attractive to repulsive forces between dust molecules in a plasma sheath
Transition from attractive to repulsive forces between dust molecules in a plasma sheath
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DOI：
10.1103/physrevlett.83.3194
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发表时间：
1999-10-18
影响因子：
8.6
通讯作者：
Piel, A
中科院分区：
文献类型：
--
作者：
Melzer, A;Schweigert, VA;Piel, A
本文定量地研究了在等离子体鞘层环境中两个单尘埃粒子系统与流动离子的静电相互作用。结果表明，负电荷的粒子之间存在吸引力的净“结合”力，导致尘埃分子的形成。通过对尘埃粒子的激光操纵，证明了引力是不对称的，它只作用于其中一个粒子。此外，粒子之间的净力可以在吸引力和排斥力之间可逆地改变。
The electrostatic interaction of a system of two single dust particles in a plasma-sheath environment with flowing ions has been investigated quantitatively. It is shown that attractive net "binding" forces between the negatively charged particles exist, leading to the formation of a dust molecule. By laser manipulation of the dust particles, it is demonstrated that the attraction is asymmetric in such a way that it acts only on one of the particles. Moreover, the net forces between the particles can be reversibly changed between attraction and repulsion.