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.