4 Concluding remarks

The RQDO formalism has been applied to the study of E2 transitions with a recently modified computer code. The line strengths supplied for several spectral series of Ni XVIII have been analysed. The RQDO procedure has once more proved to be a very useful tool for estimating transition intensities. It is particularly adequate in the cases where mass-production of data is needed, given its cost-efficiency and reasonable accuracy. It offers also the advantage of its analycity and lack of convergence problems from which elaborate ab initio calculations often suffer.

Acknowledgements

This work has been supported by the DGES of the Spanish Ministry of Education within Project No. PB97-0399-C03-01, the J.C.L. within Project No. VA 21/97. DBW thanks Alexander von Humboldt Foundation and the Polish KBN (Project No. 2 PO3B 126 14) for supporting this work.