Energies and transition wavelengths for two-electron atoms under Debye screening

•1,3 Pe and 1,3 Do states of plasma-embedded two-electron systems are investigated.•Present calculations are based upon highly-correlated exponential wave function.•2pnnp 1,3 Pe and 2pnnd 1,3 Do (n≤5n≤5) states energies are presented in plasma medium.•Wavelengths for various 1Pe→1 Do and 3Pe→3Do transitions are reported in plasmas.•Transition wavelengths show interesting behavior with increasing plasma strength.

The effect of Debye screening on the doubly excited nonautoionizing 1,3 Pe and 1,3 Do states of two-electron ions has been investigated using highly-correlated exponential wave function within the framework of the Ritz variational principle. The 2pnnp 1 Pe (n>3n>3), 2pnnp 3 Pe (n≥3n≥3) and 2pnnd 1,3 Do (n>3n>3) states energies and wavelengths for various transitions in Li+, Be2+, B3+ and C4+ are reported for different screening parameters. The 2pnnp 1 Pe (n≥3n≥3), 2pnnp 3 Pe (n≥2n≥2) and 2pnnd 1,3 Do (n≥3n≥3) states energies and transitions wavelengths for N5+, O6+, F7+ and Ne8+ are also reported as functions of the screening parameters. Transition wavelengths show interesting behavior with increasing screening strength and nuclear charge.