Astronomy and Astrophysics – Astronomy
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..dmp.l5007p&link_type=abstract
American Physical Society, 2002 Division of Atomic, Molecular and Optical , abstract #L5.007
Astronomy and Astrophysics
Astronomy
Scientific paper
Thoretically self-consistent calculations are carried out for the inverse processes of photoionization and (e + ion) recombination in the coupled channel approximation using an identical eigenfunction expansion for atoms and ions for both processes. The treatment for (e + ion) recombination subsumes the non-resonant radiative recombination and the resonant dielectronic recombination (RR and DR) processes in a unified scheme(S.N. Nahar and A.K. Pradhan, Phys. Rev. A 49), 1816 (1994);H.L. Zhang, S.N. Nahar, and A.K. Pradhan, J.Phys.B, 32,1459 (1999).. Results are presented for carbon-like ions Ar XIII, Ca XV and Fe XXI. Level-specific calculations for each ion are carried out for a large number of about 700 bound states with n <= 10 and l <= 9. Recombination to all higher nℓ levels, 10 < n <= , is consdered via close coupling calculations for DR. Relativistic effects are included using the Breit-Pauli R-matrix approximation for the He- and Li-like ions, O VI and O VII, important in X-ray astronomy. In addition to the total, unified recombination rates (α_R(T)), level-specific recombination rates and photoionization cross sections (σ_PI(E)) are obtained for a large number of bound levels for each ion. Partial support from the NSF and NASA is acknowledged.
Nahar Sultana
Pradhan Anil
Zhang Hong Lin
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