IOP Publishing, Journal of Physics B: Atomic, Molecular and Optical Physics, 14(42), p. 141002, 2009
DOI: 10.1088/0953-4075/42/14/141002
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We present kinematically complete data on two photon double ionization of Ne induced by short similar to 25 fs intense similar to 5 x 10 13 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 beta parameters significantly deviate from the results of an earlier non coincident experiment providing benchmark data for theory