Transition wavelengths for helium atom in weakly coupled hot plasmas

We have investigated the effect of surrounding plasmas on several singly excited and doubly excited meta-stable bound states of helium atom using highly correlated basis functions for singly excited S, P, D states and CI-type basis functions for doubly excited meta-stable D states. Plasma effect is taken care of by using a screened Coulomb (Yukawa) potential obtained from the Debye model that admits a variety of plasma conditions, and such a model plays an important role in plasma spectroscopy. The wavelengths for transitions from the 1snp 1P° (n=2,3)→1s21Se, 1snp 3P° (n=2,3)→1s2s 3Se, 2pnp 1Pe (n=3,4)→1s2p 1P°, 2pnp 3Pe (n=2,3)→1s2p 3P°, 2pnd 1D° (n=3,4)→1s3d 1De, 2pnd 3D° (n=3,4)→1s3d 3De, 2p3p 1Pe→2pnd 1D° (n=3,4), 2pnd 1D°(n=3, 4)→2p4p 1Pe, 2pnp 3Pe (n=2,3)→2p3d 3D°, and 2pnp 3Pe (n=2,3)→2p4d 3D° of helium atom in plasmas for various Debye lengths are reported.