Double ionization in R-matrix theory using a two-electron outer region

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We have developed a two-electron outer region for use within R-matrix theory to describe double ionisation processes. The capability of this method is demonstrated for single-photon double ionisation of He in the photon energy region between 80 eV to 180 eV. The cross sections are in agreement with established data. The extended RMT method also provides information on higher-order processes, as demonstrated by the identification of signatures for sequential double ionisation processes involving an intermediate He+ state with n=2.
Original languageEnglish
Article number022504
Number of pages5
JournalPhysical Review A (Atomic, Molecular, and Optical Physics)
Issue number2
Publication statusPublished - 10 Aug 2015


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