Electron impact excitation of positive ions in dense plasma

The authors present a generalised method for the calculations of inelastic collision strengths for scattering of electrons by ions in dense plasma taking account of the shielding of the Coulomb potential by the Debye-Huckel model. Matrix elements between arbitrary initial and final Slater orbitals are obtained in closed form. Results for the 1s-2p transition in the He + ion due to Hatton et al. (1981) have been reproduced and new results have been presented for 1s-3d and 1s-4f transitions.