Failure of single-configuration Dirac-Fock wave functions in the nonrelativistic limit

We have found earlier that a certain type of multiconfiguration Dirac-Fock wave functions may not have the correct nonrelativistic limit in the spin q uantum number, and hence may result in large errors in the transition proba bilities for spin-forbidden, weak transitions. In this article, we report t hat the failure to have the correct nonrelativistic limit can also occur in a certain type of single-configuration Dirac-Fock wave functions. Examples of such a case, along with an effective remedy, are illustrated using the spin-forbidden transitions, 2p(4) 3s P-4 --> 2p(5) P-2, in F and Ne+.