Vol. 53, No. 4
October 1999
pp. 733-741

Photoionization of Al IV (neon-type) from its ground 2s ² 2p ^{6 1}S^e and excited 2s²2p⁵3p^{3 ; 1}P^{0 3}S^e states using the R-matrix method

MAN MOHAN*^y , M LE DOURNEUF ^z, A HIBBERT^y and P G BURKE^y

*Department of Physics and Astrophysics, Delhi University, Delhi 110 007, India
^zUniversitat Rennes 1, 3502 Rennes, France
^yDepartment of Applied Mathematics and Theoretical Physics, Queen's University of Belfast, Belfast BT7 1NN, Northern Ireland
Email: sneh@del2.vsnl.net.in
MS received 29 April 1999

Abstract.

The R-matrix method is used to calculate the total photoionization cross-sections from the ground 2s ²2 p^{6 1}S^e and the first three excited 2 s²2 p⁵3 p^{3 ; 1}P⁰ 3S^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 - 2 s²2 p^{5 2}P⁰, 2 s 2 p^{6 2}S^e, 2 s 2 p^{6 2}S^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 2 s 2 p^{6 2}S^e excited threshold.

Keywords. Photoionization; configuration interaction; R-matrix method.

PACS Nos 32.80 Fb; 32.80-t

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