Electron impact excitation rate coefficients for Mg(3+) and Mg(4+)

Details Electron impact excitation rate coefficients for Mg(3+) and Mg(4+) Electron impact excitation rate coefficients for Mg(3+) and Mg(4+)

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.224p...7m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 224, Jan. 1, 1987, p. 7P-12P.

Astronomy and Astrophysics

Astronomy

12

Electron Impact, Manganese Ions, Planetary Nebulae, Stellar Composition, Abundance, Excitation, High Temperature, Maxwell-Boltzmann Density Function, Thomas-Fermi Model

Scientific paper

Effective collision strengths are calculated for the 2P3/20-2P1/20 transition in Mg3+ and for the transitions within the 2p4 configuration of Mg4+. Five-state close-coupling approximations are used including configuration interaction in the target. For Mg3+ good agreement is found with previous results, but those for Mg4+ are increased by as much as a factor of 3 due to the contribution of resonances. A predicted gradient in the magnesium abundance of the planetary nebula NGC 7027 is discussed in the light of these new results.

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