The R matrix approximation is used to compute the excitation collision strength of electron impact on Li like C with the configuration interaction wavefunctions, in which the configuration interactions of an inner shell electron excitation are included.

The spin-other orbit interaction in the Rydberg states of Lithium-like atoms;

The non-relativistic energy expression of the Lithium-like atoms 1s23d2D states is derived using general expression of non-relativistic energy for atoms with three valence electrons.

In this paper, the energy levels and the fine structure of lithium-like atoms have been investigated.

The 2s-2p Excitation cross sections of Lithium-like ions by Electron Impacts;

The quantumelectrodynamics contributions to the transition energy are also evaluated by usi.

Energy level intervals, QED contributions and transition probabilities of magnetic dipole (M1) and electronic dipole (E1) for 1s 23s 2S 1/2→1s 22s 2S 1/2,and 1s 22p 2P 1/2→1s 22s 2S 1/2 transitions are calculated for the Li-like ions (Z3～100) using the fully relativistic multiconfiguration Dirac-Fock method with Breit and QED correction.