Oscillator strengths for (1s22pnL)L states of beryllium isoelectronic sequence

We studied (1s22pnL)L(L ⩽ 2) states of beryllium isoelectronic sequence (Z = 5, 7 and 9). A model-potential method is used with selecting B-spline basis functions in a CI scheme. The energies and wave functions of the bound states, (1s22pnL)L states, were calculated and used to calculate the oscillator strengths for the electric dipole transitions. We also included the core-polarisation effect. The oscillator strengths were also calculated for transitions amongst (1s22pnL)L and (1s22snL)L or (1s22pnl)L (l ≠ L) states. We have calculated (1s22snL)L and (1s22pnl)L (l ≠ L) states of beryllium isoelectronic sequence [M.-K. Chen, Phys. Scr. T 80 (1999) 485].