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Collision strength; configuration interaction

Collision strengths for all the transitions between the 15 lowest states of neon-like Ni XIX have been calculated for electron impact in the 80–140 Ry energy range. Configuration-interaction wavefunctions have been used to represent the target states. The standardR-matrix code has been used to calculate the lower scattering partial waves (L≤9), while a no-exchange version of the same code has been used to compute efficiently the higher partial waves (L≥10). Effective collision strengths for 105 excitation transitions between the ground state 2s²2p⁶¹S^e and the 142s²2p⁵3l Rydberg states are tabulated for electron temperatures in the range logT=5.40 to logT=7.00, withT expressed in °K.

Man Mohan¹ M Le Dourneuf² A Hibbert³ V M Burke³

1. Department of Physics and Astrophysics, Delhi University, Delhi - 110 007, India
2. Départment “Atomes et Molécules en Astrophysique”, Observatoire de Paris, Laboratoire de Théorie des Processus Atomiques et Moléculaires (U.P.R. 261 du C.N.R.S.), Meudon - 92195, France
3. Department of Applied Mathematics and Theoretical Physics, The Queen’s University, Belfast - BT7 1NN, UK

Published

October 1993

Manuscript received

12 July 1993