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Experimental observation of torsions in a single-layer complex plasma crystal

Nosenko, V. and Zhdanov, Sergey and Thomas, Hubertus and Carmona-Reyes, J. and Hyde, T. W. (2016) Experimental observation of torsions in a single-layer complex plasma crystal. 4th International Soft Matter Conference, 12-16 September 2016, Grenoble, France. (Unpublished)

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A complex plasma is a weakly ionized gas which includes small particles of solid matter. Particles charge up (usually negatively) by collecting electrons and ions from the plasma and interact with each other through the screened Coulomb potential. They can be suspended in the plasma regions where gravity is compensated by other Forces (e.g., electrostatic, thermophoretic). Due to the high particle charge, their suspensions are often strongly coupled and can be in a liquid or even crystalline state. The latter is called a plasma crystal. In experiments with monodisperse particles, single-layer (2D) plasma crystals can be produced. They are popular model systems where various phenomena can be studied in real time at the Level of individual particles. In this presentation, we report on a new type of collective excitation in 2D plasma crystals, a spinning pair of particles, which we call a "torsion". A torsion is a pair of identical particles oriented along the flow of ions (orthogonal to the plane of plasma crystal), which is spinning around its axis. It is a dissipative structure where energy input is provided by the flow of ions and energy dissipation is through the neutral gas friction on particles. Non-reciprocal attraction between the particles in a torsion is due to the plasma wake effect.

Item URL in elib:https://elib.dlr.de/106168/
Document Type:Conference or Workshop Item (Poster)
Title:Experimental observation of torsions in a single-layer complex plasma crystal
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Nosenko, V.v.nosenko (at) dlr.deUNSPECIFIED
Zhdanov, Sergeysergey.zhdanov (at) dlr.deUNSPECIFIED
Thomas, HubertusDLR Research Group Complex Plasma, OberpfaffenhofenUNSPECIFIED
Carmona-Reyes, J.Baylor University, Waco, Texas, USAUNSPECIFIED
Hyde, T. W.Baylor University, Waco, Texas, USAUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:complex plasma, particle pairing
Event Title:4th International Soft Matter Conference
Event Location:Grenoble, France
Event Type:international Conference
Event Dates:12-16 September 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Komplexe Plasmen / Laboratory research
Location: Oberpfaffenhofen
Institutes and Institutions:Research Group Complex Plasma
Deposited By: Nosenko, Volodymyr
Deposited On:23 Sep 2016 23:09
Last Modified:23 Sep 2016 23:09

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