An R-matrix with pseudo-state approach to the single photon double ionization and excitation of the He-like Li+ ion

作者：McLaughlin B M^*

来源：Journal of Physics B: Atomic, Molecular and Optical Physics , 2013, 46(7): 075204.

DOI：10.1088/0953-4075/46/7/075204

The success of the R-matrix with pseudo-state (RMPS) method to model single photoionization processes, benchmarked against dedicated synchrotron light source measurements, is exploited and extended to investigate, single photon double ionization cross-sections for the He-like, Li+ ion. We investigate these processes from both the ground state and the excited 1s2s S-1,S-3 metastable levels of this He-like system. Comparisons of the results from the RMPS method are made with other state-of-the-art theoretical approaches such as time-dependent close-coupling (TDCC), B-splines and the convergent close-coupling (CCC). Excellent agreement with various other theoretical approaches are achieved but differences occur which are highlighted and discussed. For the ground state the peak of the cross-section is similar to 2 kilo-barns (Kb), that for the 1s2s S-1 state is similar to 6 and similar to 1 Kb for the corresponding 1s2s S-3 state. All the cross-sections for single photon double ionization are extremely small, being in the region of 2-10 Kb, or less, rendering their experimental determination extremely challenging.

• 出版日期2013-4-14