B-spline-based multichannel K-matrix method for atomic photoionization - art. no. 062704

We present a B-spline-based multichannel K-matrix method following an exten sion from a B-spline-based configuration-interaction approach. Theoretical procedures are presented in detail for its application to photoionization f rom two-electron and divalent (e.g., alkaline-earth) atoms. Numerical examp les, including doubly excited photoionization spectra above the N = 2 thres hold from the He 1s2s S-1 metastable state, are also given.