Wavelengths for 2pnp 1Pe→2pnd 1Do and 2pnp 3Pe→2pnd 3Do transitions in Li II, Be III, B IV, C V using correlated exponential wave functions

Doubly-excited 1,3Pe and 1,3Do states of Li II, Be III, B IV, C V are calculated using highly correlated exponential wave functions within the framework of Ritz variational principle. The wavelengths for the 2pnp 1Pe→2pn′d 1Do (n, n′≤7) and 2pnp 3Pe→2pn′d 3Do (n, n′≤7) transitions are reported. Our present results for the 2pnp 1,3Pe and 2pnd 1,3Do states energies are accurate in precision compared to the results of previous calculations. Comparisons are also made with the experimental results. The effective quantum numbers (n⁎) for the 2pnp 1,3Pe and 2pnd 1,3Do states are also reported.

► Doubly excited 1,3Pe states energy levels of Li II, Be III, B IV, C V are presented. ► Doubly excited 1,3Do states energy levels of the above systems are also presented. ► Wavelengths for 2pnp 1Pe→2pn′d 1Do (n, n′≤7) transitions are reported. ► Wavelengths for 2pnp 3Pe→2pn′d 3Do (n, n′≤7) transitions are also reported. ► Comparisons are also made with the experimental results.