Relative populations for levels in the 3d2 ground configuration of Fe VII

Details Relative populations for levels in the 3d2 ground configuration of Fe VII Relative populations for levels in the 3d2 ground configuration of Fe VII

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368..486k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 20, 1991, p. 486-490.

Other

9

Atomic Energy Levels, Emission Spectra, Ground State, Metallicity, Planetary Nebulae, Atomic Excitations, Electron Energy, Iron

Scientific paper

R-matrix calculations of electron impact exxcitation rates in Fe VII are used to derive relative populations for all levels in the 3d2 ground configuration. Results are presented for a wide range of electron temperatures and densities applicable to astrophysical plasmas. The calculations are used in conjunction with observed emission-line ratios for the planetary nebula NGC 7027 to derive the electron temperature of the Fe VII-emitting region, which is found to be in good agreement with the values of Te deduced from other highly ionized species in the planetary.

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