Class Lithium-ion Inner Shell Excitation And Absorption Spectroscopy

We use the methods of Rayleigh-Ritz variational and multiconfiguration-interaction to study the excited states of the lithium isoelectronic. Binding energy and electron affinity of He- (Z=2)are studied, He- is the simplest unstable negative ion and represents an interesting Li-like three-electron system. First we get the energy of 1s2s2p~4Po, then we calculate the state 1s2s 3S of He, so we can get the electron affinity of He- .We also study the energies, wave functions (Z=3-10) of the lithium isoelectronic(including1s2s2p~4Po,1s2s3p~4Po,1s2p3s~4Po,1s2p3d~4Po,1s2s4p~4Po,and 1s2p2p 4Pe). Then we calculate their nonrelativistic energies and relativistic energies mainly. Relativistic energies, which are highly precised, are obtained by including both relativistic correction and mass polarization. At the same time, we also calculate the displacement and fine-structure splitting for different J for our system and oscillator strength and transition rate between 1s2p2p~4Pe and 1s2s2p~4Po, 1s2s3p~4Po,1s2p3s~4Po, 1s2p3d~4Po,1s2s4p~4Po. By studying the data, we have the plot to search the regularities of the relativistic energies, mass polarization etc. with the change of atomic number Z. Compared with these data, we find that our results are in excellent agreement with other experimental and theoretical results. It proves that the our methods is sufficiently scientific and effective.