ACCURATE CALCULATION OF THE ISOTOPE SHIFT AND HYPERFINE-STRUCTURE IN THE BORON (B-II) LINE AT 1362 ANGSTROM

An extensive multiconfiguration Hartree-Fock (MCHF) calculation of the isotope shift and hyperfine structure in the resonance line of B II a t 1362 angstrom has been performed. The calculated B-11-B-10 isotope s hift is 13.3 mangstrom with an estimated uncertainty of 1%. The calcul ated interaction constants A and B give a hyperfine structure splittin g of less than 0.45 mangstrom for both isotopes. The size of the isoto pe shift in the B II line is similar to the limit of detection in high -resolution observations with the Goddard High Resolution Spectrograph aboard the Hubble Space Telescope when side A becomes operational aft er the service mission.