QUARTET TRANSITIONS IN NEUTRAL NITROGEN

Oscillator strengths for the four lowest S-4(o)-P-4 transitions of neu tral nitrogen are calculated in a non-orthogonal framework which allow s the 2s and 2p (and other) orbitals to be represented by radial funct ions which are different for different states even within the same LS- symmetry. Previous calculations of these transitions have met with dif ficulties in obtaining agreement between the length and velocity forms of the oscillator strength which have been overcome only by using sev eral thousand configurations in the representation of the wavefunction s. In our work we have obtained comparable agreement with these extens ive calculations and also with experiment by using a total of only 26 configurations within our non-orthogonal procedure.