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1.
Phys Rev E Stat Nonlin Soft Matter Phys ; 86(3 Pt 2): 036404, 2012 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-23031031

RESUMO

We have performed experimental and theoretical investigation of the formation and behavior of Coulomb clusters of charged diamagnetic particles in a cusp magnetic trap under microgravity conditions aboard the International Space Station. Graphite particles of 100-400 µm in size were used in experiments due to the highest specific magnetic susceptibility. We have observed the formation of clusters in the shape of an oblate ellipsoid of revolution and their oscillations after dynamical action by changing the magnetic field. Observing the excitation and damping of oscillations we have made some estimations. Molecular dynamics simulations of the observed processes have been made. Their results are in reasonable agreement with experiments. Some differences are evidently due to some unaccounted-for reasons.


Assuntos
Poeira , Modelos Químicos , Gases em Plasma/química , Eletricidade Estática , Ausência de Peso , Simulação por Computador , Tamanho da Partícula
2.
Phys Rev Lett ; 99(5): 055003, 2007 Aug 03.
Artigo em Inglês | MEDLINE | ID: mdl-17930764

RESUMO

It is shown that the electrostatic interaction potential between a pair of positively charged particles embedded in a highly collisional plasma has a long-range attractive asymptote. The effect is due to continuous plasma absorption on the particles. The relevance of this result to experimental investigations of complex (dusty) plasmas is discussed.

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