Calculation of Li-like Al ion energy level structure and Ab initio AIXI spectral property

By Hartree-Fock-Relativistic (HFR) Self-consistent field method, calculation of Li-like Al ion energy levels in configurations 1s2nl (n 2-7, l = 0-5), 1 snln'l' (n,n' = 2-3; l,l' = 0-2) is made and Ab initio AIXI wavelengths below 40 nm involving electric dipole transition (EI) between the energy levels of above the configurations are reported. Corresponding transition probabilities and oscillator strengths are given. The accuracy of wavelength calculation is better than 1% in all cases where existing data allow for comparison. The calculated wavelengths of Al 3d-4f, 3d-5f transition are in good agreement with the observed transition wavelengths at which soft X-ray lasers have been experimentally demonstrated