Direct and resonance contributions to electron-impact excitation of n = 2 to n = 3 transitions in neonlike ions

Details Direct and resonance contributions to electron-impact excitation of n = 2 to n = 3 transitions in neonlike ions Direct and resonance contributions to electron-impact excitation of n = 2 to n = 3 transitions in neonlike ions

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phrva..40.2292c&link_type=abstract

Physical Review A - General Physics, 3rd Series (ISSN 0556-2791), vol. 40, Sept. 1, 1989, p. 2292-2300.

Physics

General Physics

25

Atomic Excitations, Electron Impact, Electron Transitions, Molecular Ions, Resonance Fluorescence, Atomic Energy Levels, Autoionization, Ground State, Neon, Wave Functions

Scientific paper

Electron-impact-excitation rate coefficients for highly charged ions are important for studies of astrophysical and laboratory-produced plasmas. Fully relativistic calculations of direct and resonance-enhanced rate coefficients for n = 2 to n = 3 transitions are reported for six ions of the neon isoelectronic sequence with atomic numbers from 15, 17, 26, 34, 42, and 54. The contributions from autoionizing resonances are evaluated using a multiconfiguration Dirac-Fock model. These resonances enhance the rate coefficients for transitions to the 2p5 3s states by as much as a factor of three. The peak rate coefficient and the relative importance of resonance excitation diminish with increasing atomic number. It is found that resonance enhancements are generally quite large for electron temperatures less than the temperature where peak excitation occurs. The total rate coefficients for Se(24+) are in good agreement with close-coupling results obtained with R-matrix calculations.

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