Photoionization, transition probabilities, and opacities

Details Photoionization, transition probabilities, and opacities Photoionization, transition probabilities, and opacities

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..547..279n&link_type=abstract

ATOMIC PROCESSES IN PLASMAS: Twelfth Topical Conference. AIP Conference Proceedings, Volume 547, pp. 279-293 (2000).

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Photoionization Of Atoms And Ions, Atomic Processes And Interactions, Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation

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Opacity is a measure of radiation transport through matter. Determination of plasma opacities requires radiative data for bound-bound transitions, the oscillator strengths (f-values), and bound-free transitions, the photoionization cross sections (σPI), for many levels of the atomic species in all ionization states in the plasma. Hence, large-scale computations are needed to obtain these atomic parameters. Under an international initiative, the Opacity Project (OP), these processes were studied in detail and large-scale ab initio calculations were carried out using the close coupling R-matrix method for the f-values and σPI of most astrophysically abundant atoms and ions. Application of these data for stellar opacities solved some outstanding problems in astronomy. We have further extended the OP work to electron-ion recombination (the inverse process), unifying the non-resonant and resonant recombination processes, radiative and di-electronic recombination, heretofore treated independently. A theoretically self-consistent treatment of photoionization and recombination is also thereby enabled. In addition, new relativistic calculations using the Breit-Pauli R-matrix (BPRM) method are being carried out under the Iron Project, a second on-going initiative for high-precision studies of collisional and radiative processes of iron and iron-peak elements. The photoionization and recombination cross sections show excellent agreement with recent experiments. .

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