Branching fractions and transition probabilities for Ga II, In II and Tl II from measured lifetime and energy level data

Branching fractions and relative transition probabilities are predicted for the ns(2)-nsnp and nsnp-nsnd supermultiplets in Ga II, In II and T1 II thr ough a data-based systematization of measured lifetime and spectroscopic en ergy level data. A formalism is used that parametrizes the effects of Coulo mb exchange, spin-orbit and spin-other-orbit interactions, and differences between the radial wave functions of the singlet and triplet states to dedu ce effective intermediate coupling amplitudes. Connections between singlet and triplet lifetimes and among triplet lifetimes are examined and predicti ons are made where data do not currently exist.