Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...211..605j&link_type=abstract
Astrophysical Journal, vol. 211, Jan. 15, 1977, pt. 1, p. 605-616. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
265
Autoionization, Cosmic Plasma, Electron Recombination, High Temperature Plasmas, Radiative Recombination, Recombination Coefficient, Bremsstrahlung, Energy Dissipation, Gas Ionization, Iron, Metal Ions, Radiative Heat Transfer, Tables (Data)
Scientific paper
In the process of dielectronic recombination, the doubly excited state formed by radiationless capture may autoionize preferentially into an excited state of the recombining ion. This additional autoionization process has not been discussed in previous treatments of dielectronic recombination. The dielectronic recombination rates for certain nonhydrogenic Fe ions, although still larger than the direct radiative recombination rates, are found to be substantially reduced by the inclusion of the additional autoionization rate in the branching ratio for the stabilizing radiative transition. Consequently, the temperatures of maximum equilibrium abundance are significantly lower than those predicted by recent calculations. Finally, the radiative energy loss rate coefficients are calculated for radiation processes involving electron Fe-ion collisions in high-temperature plasmas. Electron impact excitation of resonance line radiation is the dominant radiative cooling mechanism in steady-state plasmas at temperatures where ions with bound electrons are abundant. However, it is found that the radiation emitted during dielectronic recombination can be more important than direct recombination radiation and bremsstrahlung.
Blaha M.
Davis Jared
Jacobs Verne L.
Kepple Paul C.
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