Accurate calculations of transition probabilities, isotope shifts and hyperfine structures for some allowed - transitions in B I, C II and C I

Results from systematic multiconfiguration Hartree - Fock calculations of transition probabilities, isotope shifts and hyperfine structures of the - and - transitions in B I, the - transitions in C II and the - transition in C I are reported. Higher-order correlation effects beyond the pair-correlation approximation are shown to be important for the transition probabilities, and are included in large configuration interaction calculations. For all the transitions except one, the agreement between the length and velocity forms of the weighted oscillator strength is better than 0.4%. The present results are believed to be substantially more accurate than those of other theories.