Volume 112, Number 4, November 2015
|Number of page(s)||6|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||01 December 2015|
Spontaneous formation and spin of particle pairs in a single-layer complex plasma crystal
1 Deutsches Zentrum für Luft- und Raumfahrt, Forschungsgruppe Komplexe Plasmen D-82234 Weßling, Germany
2 Center for Astrophysics, Space Physics, and Engineering Research, Baylor University Waco, TX 76798-7310, USA
3 Max Planck Institute for extraterrestrial Physics - D-85748 Garching, Germany
Received: 22 September 2015
Accepted: 11 November 2015
In an experiment with a single-layer plasma crystal, spontaneous pairing of particles was observed upon a sudden reduction of the discharge power. The pairs were oriented vertically with the upper particle above the crystal layer and the lower particle beneath it, the pair size was about 0.2 mm. The pairs were spinning around their vertical axis with the upper particle leading and the lower one following it; the rotation speed was 10–13 Hz. Spinning particle pairs disturbed the plasma crystal through interaction with their neighbors. Upon further reduction of the discharge power, the spinning pairs proliferated in the plasma crystal and eventually it melted. The experiment was performed with micron-size polymer particles suspended in the radio-frequency (rf) argon plasma at a pressure of 157 mtorr. We propose a theoretical model of a spinning particle pair based on the plasma wake effect. Spinning particle pairs can be used as a diagnostic tool for plasma wakes or as a generic model of a 2D system of vortices.
PACS: 52.27.Lw – Dusty or complex plasmas; plasma crystals / 52.27.Gr – Strongly-coupled plasmas
© EPLA, 2015
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.