[1] Gillaspy J D.Highly charged ions[J].J.Phys.B,2001,34:R93

[2] Wang Z W,Han Q J,Hu M H,et al.Energy and oscillator strength of V20+ ion[J].Front.Phys.China,2006,1:102

[3] Chung K T.Ionization potential of the lithium like 1s22s states from lithium to neon[J].Phys.Rev.A,1991,44:5421

[4] Bethe H A,Salpeter E E.Quantum mechanics of one-and two-electron atoms[M].Berlin:Springer,1977.

[5] Friedrich H.Theoretical atomic physics[M].Berlin:Springer,1991.

[6] Fano U,Rau A P R.Atomic collision and spectra[M].New York:Academic,1986.

[7] Cowan R D.The Theory of atomic structure and spectra[M].Berkeley:University of California Press,1981.

[8] Zilitis V A.Theoretical determination of oscillator strengths for the principal series of lithium like ions[J].Opt.Spectra,1984,55:127

[9] Sugar J,Corliss C.Atomic energy levels of the iron period elements:potassium through nickel[J].Phys.Chem.Ref.Data.,1985,14 (Suppl.2)