Dyatko, N. and Donkó, Zoltán (2015) Bistable solutions for the electron energy distribution function in electron swarms in xenon: a comparison between the results of rstprinciples particle simulations and conventional Boltzmann equation analysis. Plasma Sources Science and Technology, 24. 045002. ISSN 09630252 ; ESSN: 13616595

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Abstract
At low reduced electric elds the electron energy distribution function in heavy noble gases can take two distinct shapes. This ‘bistability effect’—in which electron–electron (Coulomb) collisions play an essential role—is analyzed here for Xe with a Boltzmann equation approach and with a rst principles particle simulation method. The solution of the Boltzmann equation adopts the usual approximations of (i) searching for the distribution function in the form of two terms (‘twoterm approximation’), (ii) neglecting the Coulomb part of the collision integral for the anisotropic part of the distribution function, (iii) treating Coulomb collisions as binary events, and (iv) truncating the range of the electron–electron interaction beyond a characteristic distance. The particlebased simulation method avoids these approximations: the manybody interactions within the electron gas with a true (untruncated) Coulomb potential are described by a molecular dynamics algorithm, while the collisions between electrons and the background gas atoms are treated with Monte Carlo simulation. We nd a good general agreement between the results of the two techniques, which con rms, to a certain extent, the approximations used in the solution of the Boltzmann equation. The differences observed between the results are believed to originate from these approximations and from the presence of statistical noise in the particle simulations.
Item Type:  Article 

Subjects:  Q Science / természettudomány > QC Physics / fizika Q Science / természettudomány > QC Physics / fizika > QC04 Electricity. Magnetism. Electromagnetism / villamosság, mágnesesség, elektromágnessesség 
Depositing User:  Dr Peter Hartmann 
Date Deposited:  18 Apr 2017 14:08 
Last Modified:  18 Apr 2017 14:08 
URI:  http://real.mtak.hu/id/eprint/51452 
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