Do1,3 and Pe1,3 states of two electron atoms under Debye plasma screening

Extensive non-relativistic variational calculations for estimating the energy values of 2pnd(Do1,3) states [n=3-6] of two electron atoms (He, Li+,Be2+) and 2pnp(Pe1)[n=3-8] and 2pnp(Pe3) states [n=2-7] of Be2+ under weakly coupled plasma screening have been performed using explicitly correlated Hylleraas type basis. The modified energy eigenvalues of Pe1,3 states arising from two p electrons of Be2+ ion and Do1,3 states due to 2pnd configuration of Li+ and Be2+ ion in the Debye plasma environment are being reported for the first time. The effect of plasma has been incorporated through the Debye screening model. The system tends towards gradual instability and the number of bound states reduces with increasing plasma coupling strength. The wavelengths for 2pn′p(Pe1)[n′=3-8]→2pnd(Do1)[n=3-6] and 2pn′p(Pe3)[n′=2-8]→2pnd(Do3)[n=3-6] transitions in plasma embedded two electron atoms have also been reported.