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Title: The role of excited-state ionization on the effective ionization of neutral neon using non-perturbative atomic data

Abstract

With the aim of providing accurate atomic data for plasma edge temperature and density modeling with neutral neon, new non-perturbative R-Matrix with Pseudostates (RMPS) calculations are performed for both the electron-impact excitation and ionization of neutral neon. The new calculations agree well with past measurements and calculations for both electron-impact excitation and ionization. For ionization, the addition of pseudostates from $$5\bar{d}$$ to $$12\bar{i}$$ allows us to extract new cross sections and rate coefficients for all of the excited states through 2p 5 5p. The new RMPS ionization calculation gives a 20% increase in the cross section for the $$2{p}^{5}5s$$ ionization compared with previous non-perturbative calculations and shows classically-expected n 4-scaled convergence for the np and nd valence shells. Ionization from these excited states contributes significantly to the effective ionization rate coefficient: a factor of three more than the ground-state ionization rate coefficient at an electron temperature of 25 eV and density of 1014 cm−3. An accurate, non-perturbative set of atomic rates, both LS- and LSJ-resolved, for neutral neon across a wide range of temperatures and densities is compiled.

Authors:
ORCiD logo [1];  [1];  [1];  [1]
  1. Auburn Univ., AL (United States). Dept. of Physics
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); UT-Battelle LLC/ORNL, Oak Ridge, TN (Unted States); Auburn Univ., AL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1565766
DOE Contract Number:  
AC05-00OR22725; SC0015877
Resource Type:
Journal Article
Journal Name:
Journal of Physics. B, Atomic, Molecular and Optical Physics
Additional Journal Information:
Journal Volume: 52; Journal Issue: 9; Journal ID: ISSN 0953-4075
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
Optics; Physics

Citation Formats

Favreau, C. J., Johnson, C. A., Ennis, D. A., and Loch, S. D. The role of excited-state ionization on the effective ionization of neutral neon using non-perturbative atomic data. United States: N. p., 2019. Web. doi:10.1088/1361-6455/ab13f4.
Favreau, C. J., Johnson, C. A., Ennis, D. A., & Loch, S. D. The role of excited-state ionization on the effective ionization of neutral neon using non-perturbative atomic data. United States. doi:10.1088/1361-6455/ab13f4.
Favreau, C. J., Johnson, C. A., Ennis, D. A., and Loch, S. D. Tue . "The role of excited-state ionization on the effective ionization of neutral neon using non-perturbative atomic data". United States. doi:10.1088/1361-6455/ab13f4.
@article{osti_1565766,
title = {The role of excited-state ionization on the effective ionization of neutral neon using non-perturbative atomic data},
author = {Favreau, C. J. and Johnson, C. A. and Ennis, D. A. and Loch, S. D.},
abstractNote = {With the aim of providing accurate atomic data for plasma edge temperature and density modeling with neutral neon, new non-perturbative R-Matrix with Pseudostates (RMPS) calculations are performed for both the electron-impact excitation and ionization of neutral neon. The new calculations agree well with past measurements and calculations for both electron-impact excitation and ionization. For ionization, the addition of pseudostates from $5\bar{d}$ to $12\bar{i}$ allows us to extract new cross sections and rate coefficients for all of the excited states through 2p 5 5p. The new RMPS ionization calculation gives a 20% increase in the cross section for the $2{p}^{5}5s$ ionization compared with previous non-perturbative calculations and shows classically-expected n 4-scaled convergence for the np and nd valence shells. Ionization from these excited states contributes significantly to the effective ionization rate coefficient: a factor of three more than the ground-state ionization rate coefficient at an electron temperature of 25 eV and density of 1014 cm−3. An accurate, non-perturbative set of atomic rates, both LS- and LSJ-resolved, for neutral neon across a wide range of temperatures and densities is compiled.},
doi = {10.1088/1361-6455/ab13f4},
journal = {Journal of Physics. B, Atomic, Molecular and Optical Physics},
issn = {0953-4075},
number = 9,
volume = 52,
place = {United States},
year = {2019},
month = {4}
}

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