Doubly excited states of three-electron systems (Z = 2 to 10) below the (1s21)SLπ threshold
A systematic experimental and theoretical study of doubly excited ls21nl’ states of three-electron ions has been performed. Theoretically the truncated diagonalization method (TDM) has been used to generate both non-relativistic and relativistic energy values, wave functions and quantum defects for 42 different Rydberg series converging to four different thresholds, i.e. (ls2s)3Se, 1Se and (ls2p)3P°, 1P°. This comprehensive data base has been used to classify recent high resolution Auger electron spectra arising from Li-like states. Specifically we have analyzed He-, C3+, O5+ and Ne7+ Auger electron data produced by double electron capture in slow ion-atom collisions. Numerous new lines associated with (ls21nl’) Rydberg levels have been identified.
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