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Electric Microfield Distributions in Alkali Plasmas with Account of the Ion Structure in a Moderately Coupled Approximation
Author(s) -
Sadykova S. P.,
Ebeling W.,
Sokolov I. M.
Publication year - 2011
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201010122
Subject(s) - pseudopotential , ion , atomic physics , plasma , electric field , physics , electron , debye , quantum , materials science , chemistry , quantum mechanics
Abstract The electric microfield distributions (EMD) have been calculated at the location of an ion for Alkali plasmas ( Li + , Na + , K + , Cs + ) using a coupling parameter integration technique originally developed by Ortner et al. for point‐like (structureless) ions [1]. EMD are studied in a frame of the Hellmann‐Gurskii‐Krasko (HGK) pseudopotential model, taking into account the quantum‐mechanical effects and the ion shell structure [2]. For determination of the radial distribution function the screened HGK pseudopotential in a moderately coupled approximation, based on a chain of Bogoljubow equations for the equilibrium distribution functions [3], taking into account not only the quantum‐mechanical effects, the ion shell structure but screening field effects has been used [4]. The new expressions for the screened HGK potential have been derived. At the derivation the electron‐electron corrected Kelbg micropotential instead of earlier applied Deutsch potential has been used. The results obtained for the EMDs in the Hellmann‐Gurskii‐Krasko moderately coupled approximation for a moderately coupled plasma in a framework of the Ortner model show a considerable improvement of the results obtained in the Debye screening approximation (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)