Photoionization and Recombination

Details Photoionization and Recombination Photoionization and Recombination

2000-03-27

arxiv.org/abs/astro-ph/0003409v1

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, In Proc. Workshop on "Atomic Data Needs In X-Ray Astronomy" NASA Goddard Space Flight Center, Dec, 16-17,

Scientific paper

Theoretically self-consistent calculations for photoionization and (e + ion) recombination are described. An identical eigenfunction expansion for the ion is employed in coupled channel calculations for both processes, thus ensuring consistently accurate cross sections and rates in an ab initio manner. The theoretical treatment of (e + ion) recombination subsumes both the non-resonant recombination ('radiative recombination'), and the resonant recombination ('di-electronic recombination') processes in a unified scheme. In addition to the total, unified recombination rates, level-specific recombination rates and photoionization cross sections are obtained for a large number of atomic levels. Both relativistic Breit-Pauli, and non-relativistic LS coupling, calculations are carried out in the close coupling approximation using the R-matrix method. Although the calculations are computationally intensive, they yield nearly all photoionization and recombination parameters needed for astrophysical photoionization models with higher precision than hitherto possible, estimated at about 10-20 % from comparison with experimentally available data (including 'experimentally derived DR rates'). Results are electronically available for over 40 atoms and ions. Photoionization and recombination of He-, and Li-like C and Fe are described for X-ray modeling. The unified method yields total and complete (e+ion) recombination rate coeffcients, that can not otherwise be obtained theoretically or experimentally. "temp" 23 lines, 1524 characters

Affiliated with

Also associated with

No associations

Rating

Photoionization and Recombination does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Photoionization and Recombination, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoionization and Recombination will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-198647