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Free electron degeneracy effects on collisional excitation, ionization, de-excitation and three-body recombination

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JournalHIGH ENERGY DENSITY PHYSICS
DateAccepted/In press - 3 Jun 2016
DateE-pub ahead of print - 11 Jun 2016
DatePublished (current) - 1 Sep 2016
Volume20
Number of pages8
Pages (from-to)9-16
Early online date11/06/16
Original languageEnglish

Abstract

Collisional-radiative models enable average ionization and ionization populations, plus the rates of absorption and emission of radiation to be calculated for plasmas not in thermal equilbrium. At high densities and low temperatures, electrons may have a high occupancy of the free electron quantum states and evaluations of rate coefficients need to take into account the free electron degeneracy. We demonstrate that electron degeneracy can reduce collisional rate coefficients by orders-of-magnitude from values calculated neglecting degeneracy. We show that assumptions regarding the collisional differential cross-section can alter collisional ionization and recombination rate coefficients by a further factor two under conditions relevant to inertial fusion.

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© 2016 Elsevier B.V. All rights reserved. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details. Embargo period : 12 months

    Research areas

  • Collisional radiative, Dense plasmas, Electron degeneracy, NLTE

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