ATOMIC DATA FROM THE IRON PROJECT .16. PHOTOIONIZATION CROSS-SECTIONSAND OSCILLATOR-STRENGTHS FOR FE-V

Large scale ab initio calculations of photoionization and dipole trans ition probabilities for Fe V are reported. The computations were carri ed out in the close coupling approximation using the R-matrix method i ncluding 34 LS terms of the target ion Fe VI. All bound states of Fe V with n less than or equal to 10 and l less than or equal to 7 are con sidered. The results include 1816 LS bound states, dipole oscillator s trengths for 129.904 LS multiplets, and detailed photoionization cross sections with extensive resonance structures for all of the bound sta tes. These data differ significantly in many cases from the earlier da ta calculated under the Opacity Project and other theoretical calculat ions. It is expected that the new data should yield more accurate Iron opacities, particularly in objects where Fe V is observed to be one o f the dominant species, such as the atmospheres of hot, young white dw arfs at temperatures of 40.000 - 60.000 K. The present calculations we re mainly carried out on the massively parallel Cray T3D with a parall elized version of the Iron Project R-matrix codes.