Abstract
We present kinematically complete data on two-photon double ionization of Ne induced by short (∼25 fs) intense (∼5 × 1013 W cm−2) free-electron laser pulses at 44 eV. The observed electron energy spectrum points to the dominance of ‘sequential’ ionization. We analyse state-selective angular distributions as well as the two-electron angular correlation function, and suggest a method to determine the time delay between both ionization steps. The measured angular asymmetry (-) parameters significantly deviate from the results of an earlier non-coincident experiment providing benchmark data for theory.
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