ACCURATE MULTICONFIGURATION HARTREE-FOCK CALCULATIONS OF OSCILLATOR-STRENGTHS IN LIGHT-ATOMS - THE BORON (B-II) LINE AT 1362 ANGSTROM

A new method to deal with nonorthogonalities in transition calculation s has been implemented and tested. Large-scale transition calculations using the multiconfiguration Hartree-Fock (MCHF) method have been per formed for the resonance line of B II at 1362 Angstrom. In these calcu lations the orbital sets of the initial and final-state wavefunctions have not been assumed to be equal but have been optimized independentl y. The calculated weighted multiplet oscillator strength gf= 0.999 has an estimated uncertainty of less than 0.5%. Together with the previou sly calculated isotope shift and hyperfine structure (Jonsson, Johanss on, and Froese Fischer 1994), all the important atomic parameters need ed for a detailed modeling of the B II resonance line in high-resoluti on astrophysical spectra are now available with high accuracy.