Journal article
State selective single-photon double ionization of Ne indicating singlet-triplet mixing of doubly excited LS-states

Publication Details
Kilin, V.; Lazarev, D.; Lazarev, D.; Amusia, M.; Schartner, K.; Ehresmann, A.; Schmoranzer, H.
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Journal of Physics B: Atomic, Molecular and Optical Physics
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The state-selective double-photoionization cross sections of the NeIII 2s22p4 [3P,1D,1S], 2s12p5 [3P,1P] and 2s02p6 [1S] states in the exciting-photon energy region from 60 up to 200eV are calculated with the use of V(N-1) and V(N-2) potentials. To our knowledge, the basis of wavefunctions obtained with the use of the V(N-2) potential is employed for the first time for the calculation of the total DPI cross section of a many-electron atom. The lowest-non-vanishing-order perturbation theory V(N-2) cross sections are compared with V(N-1) ones and with theoretical results of other authors. The obtained results show that the V(N-1) potential overestimates and the V(N-2) potential underestimates the experimental total DPI cross section of the L shell in Ne. The best agreement with experiment is achieved for the sum of the 2s12p5 and 2s02p6 state-selective V(N-2) velocity-form cross sections. The necessity of including the higher-order correlations, especially those responsible for singlet-triplet mixing of the final doubly excited states, is demonstrated and discussed.


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