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Photoionization; configuration interaction; R-matrix method

The R-matrix method is used to calculate the total photoionization cross-sections from the ground 2s²2p⁶¹S^e and the first three excited 2s²2p⁵3p^3,1S^e states of Al IV, for photon energies ranging from the first ionization threshold to just above the second threshold of the residual ion Al V. The two lowest LS terms of Al V − 2s²2p⁵²P⁰, 2s2p⁶²S^e, 2s2p⁶²S^e, represented by sophisticated configuration interaction wavefunctions, are included in the R-matrix calculation. The resulting cross-sections are affected by Rydberg series of resonances converging to the 2s2p⁶²S^e excited threshold.

Man Mohan¹ M Le Dourneuf² A Hibbert³ PG Burke³

1. Department of Physics and Astrophysics, Delhi University, Delhi - 110 007, India
2. Universitat Rennes 1, Rennes - 3502, France
3. Department of Applied Mathematics and Theoretical Physics, Queen’s University of Belfast, Belfast - BT7 1NN, Northern Ireland

Published

October 1999

Manuscript received

29 April 1999