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Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures

Possible mechanisms of particle attraction providing formation of the field aligned microparticle strings in complex plasmas at elevated gas pressures are theoretically investigated in the light of the Plasmakristall-4 (PK-4) experiment on board the International Space Station. The particle interact...

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Autores principales: Yaroshenko, Victoria, Pustylnik, Mikhail
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7827146/
https://www.ncbi.nlm.nih.gov/pubmed/33435498
http://dx.doi.org/10.3390/molecules26020308
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author Yaroshenko, Victoria
Pustylnik, Mikhail
author_facet Yaroshenko, Victoria
Pustylnik, Mikhail
author_sort Yaroshenko, Victoria
collection PubMed
description Possible mechanisms of particle attraction providing formation of the field aligned microparticle strings in complex plasmas at elevated gas pressures are theoretically investigated in the light of the Plasmakristall-4 (PK-4) experiment on board the International Space Station. The particle interaction energy is addressed by two different approaches: (i) using the dynamically screened wake potential for small Mach numbers derived by Kompaneets et al., in 2016, and (ii) introducing effect of polarization of the trapped ion cloud by discharge electric fields. Is is found that both approaches yield the particle interaction energy which is independent of the operational discharge mode. In the parameter space of the performed experiments, the first approach can provide onset of the particle attraction and string formation only at gas pressures higher than 40–45 Pa, whilst the mechanism based on the trapped ion effect yields attraction in the experimentally important pressure range 20–40 Pa and may reconcile theory and observations.
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spelling pubmed-78271462021-01-25 Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures Yaroshenko, Victoria Pustylnik, Mikhail Molecules Article Possible mechanisms of particle attraction providing formation of the field aligned microparticle strings in complex plasmas at elevated gas pressures are theoretically investigated in the light of the Plasmakristall-4 (PK-4) experiment on board the International Space Station. The particle interaction energy is addressed by two different approaches: (i) using the dynamically screened wake potential for small Mach numbers derived by Kompaneets et al., in 2016, and (ii) introducing effect of polarization of the trapped ion cloud by discharge electric fields. Is is found that both approaches yield the particle interaction energy which is independent of the operational discharge mode. In the parameter space of the performed experiments, the first approach can provide onset of the particle attraction and string formation only at gas pressures higher than 40–45 Pa, whilst the mechanism based on the trapped ion effect yields attraction in the experimentally important pressure range 20–40 Pa and may reconcile theory and observations. MDPI 2021-01-09 /pmc/articles/PMC7827146/ /pubmed/33435498 http://dx.doi.org/10.3390/molecules26020308 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Yaroshenko, Victoria
Pustylnik, Mikhail
Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures
title Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures
title_full Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures
title_fullStr Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures
title_full_unstemmed Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures
title_short Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures
title_sort possible mechanisms of string formation in complex plasmas at elevated pressures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7827146/
https://www.ncbi.nlm.nih.gov/pubmed/33435498
http://dx.doi.org/10.3390/molecules26020308
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