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arXiv 1406.6327physics.plasm-ph
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复杂等离子体中准二维尘埃团的模式耦合和共振不稳定性

Mode coupling and resonance instabilities in quasi-two-dimensional dust clusters in complex plasmas

Ke Qiao, Jie Kong, Jorge Carmona, Lorin S. Matthews, Truell W. Hyde

摘要:

小准二维(2D)尘埃团组成的3至11个粒子在不同的射频功率下形成的氩等离子体。通过跟踪粒子热运动得到的模谱研究了它们的简正模。详细的水平和垂直模式之间的耦合模式被检测到的粒子数高达7和离散的不稳定性被发现的尘埃粒子数大于9,在以前的理论预测的离子流诱导的模式耦合在小集群。不稳定性被证明是由耦合的水平和垂直的正常模式之间的共振。

英文摘要:

Small quasi-two-dimensional (2D) dust clusters consisting of three to eleven particles are formed in an argon plasma under varying rf power. Their normal modes are investigated through their mode spectra obtained from tracking thermal motion of the particles. Detailed coupling patterns between their horizontal and vertical modes are detected for particle numbers up to seven and discrete instabilities are found for dust clusters with particle number greater than nine, as predicted in previous theory on ion-flow induced mode coupling in small clusters. The instabilities are proven to be induced by resonance between coupled horizontal and vertical normal modes.

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