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The optimum shielding around a test charge in plasmas containing two negative ions

Published online by Cambridge University Press:  15 February 2011

W. M. MOSLEM ,
R. SABRY  and
P. K. SHUKLA
W. M. MOSLEM
Affiliation:
Department of Physics, Faculty of Science, Port Said University, Port Said, Egypt ([email protected])
R. SABRY
Affiliation:
Theoretical Physics Group, Department of Physics, Faculty of Science, Mansoura University, Damietta Branch, New Damietta 34517, Egypt
P. K. SHUKLA
Affiliation:
UB International Chair, International Center for Advanced Studies in Physical Sciences, Faculty of Physics & Astronomy, Ruhr University Bochum, D-44780 Bochum, Germany
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Abstract

This paper focuses on the progress in understanding the shielding around a test charge in the presence of ion-acoustic waves in multispecies plasmas, whose constituents are positive ions, two negative ions, and Boltzmann distributed electrons. By solving the linearized Vlasov equation with Poisson equation, the Debye–Hückel screening potential and wakefield (oscillatory) potential distribution around a test charge particle are derived. It is analytically found that both the Debye–Hückel potential and the wakefield potential are significantly modified due to the presence of two negative ions. The present results might be helpful to understand and to form new materials from plasmas containing two negative ions such as Xe+ − F− − SF−6 and Ar+ − F− − SF−6 plasmas, as well as to tackle extension of the test charge problem in multinegative ions' coagulation/agglomeration.

Type
Papers
Information
Journal of Plasma Physics , Volume 77 , Issue 5 , October 2011 , pp. 663 - 673
Copyright
Copyright © Cambridge University Press 2011

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