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arXiv 1304.0932physics.plasm-phcond-mat.soft
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复合射频和直流放电中的三维复杂等离子体结构

Three dimensional complex plasma structures in a combined radio frequency and direct current discharge

S. Mitic, B. A. Klumov, S. A. Khrapak, G. E. Morfill

摘要:

我们报告的第一个详细的分析大的三维(3D)复杂的等离子体结构的实验中进行的纯射频和射频+直流放电模式。电感耦合等离子体(ICP)是由一个射频线圈在0.3毫巴的压力下缠绕在垂直放置的圆柱形玻璃管。此外,直流等离子体可以通过在远离射频线圈的管端的电极上施加电压来产生。注入的单分散颗粒悬浮在线圈下方的等离子体中。使用扫描激光片和高分辨率相机来确定约$10^5$颗粒的3D位置。所观察到的碗状粒子云揭示了各种结构的共存,包括良好区分的固体状,不太有序的液体状,和明显的弦状相。提出了识别弦状结构的新准则。

英文摘要:

We report on the first detailed analysis of large three dimensional (3D) complex plasma structures in experiments performed in pure rf and combined rf+dc discharge modes. Inductively coupled plasma (ICP) is generated by an rf coil wrapped around the vertically positioned cylindrical glass tube at a pressure of 0.3 mbar. In addition, dc plasma can be generated by applying voltage to the electrodes at the ends of the tube far from the rf coil. The injected monodisperse particles are levitated in the plasma below the coil. A scanning laser sheet and a high resolution camera are used to determine the 3D positions of about $10^5$ particles. The observed bowl-shaped particle clouds reveal coexistence of various structures, including well-distinguished solid-like, less ordered liquid-like, and pronounced string-like phases. New criteria to identify string-like structures are proposed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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