The RQDO procedure has once more proved to be a very useful tool for estimating transition probabilities. 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 analiticity and lack of convergence problems from which elaborate ab initio calculations often suffer.
One drawback of the RQDO formalism is that it needs quantum defects from other sources as an input. But this can be, in many cases, circumvented by making use of the regularities presented by the quantum defects both along spectral series and isoelectronic sequences, which allow for inter- or extrapolations.
This work has been supported by the DGICYT of the Spanish Ministry of Education within Project No. PB94-1314-C03-03 and the J.C.L. within Project No. VA 21/97.
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