Transition probabilities for BeI, BeII, MgI, and MgII

The Weakest Bound Electron Potential Model (WBEPM) is used to calculate tra nsition probabilities between LS multiplets of Be I, Be II, Mg I, and Mg II . In this calculation, a coupled set of equations is employed to determine effective charges Z* and effective quantum numbers n* and l* using, as inpu t data, experimental energy levels and radial expectation values obtained w ith the numerical Coulomb approximation. Transition probabilities between h ighly excited states are evaluated using modified hydrogenic wavefunctions. Good agreement is seen in comparisons of the present results with those fr om other works. (C) 2001 Academic Press.