M Kurka et al 2009 J. Phys. B: At. Mol. Opt. Phys. 42 141002 doi:10.1088/0953-4075/42/14/141002
Two-photon double ionization of Ne by free-electron laser radiation: a kinematically complete experiment
FREE ARTICLEM Kurka1, A Rudenko2, L Foucar3, K U Kühnel1, Y H Jiang1, Th Ergler1, T Havermeier3, M Smolarski3, S Schössler3, K Cole3, M Schöffler3, R Dörner3, M Gensch4,8, S Düsterer4, R Treusch4, S Fritzsche5,6, A N Grum-Grzhimailo7, E V Gryzlova7, N M Kabachnik7,8, C D Schröter1, R Moshammer1,2 and J Ullrich1,2
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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.
- PACS
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32.80.Rm Multiphoton ionization and excitation to highly excited states
- Subjects
- Dates
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Issue 14 (28 July 2009)
Received 5 May 2009, in final form 4 June 2009
Published 24 June 2009
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Two-photon double ionization of Ne by free-electron laser radiation: a kinematically complete experiment
M Kurka et al 2009 J. Phys. B: At. Mol. Opt. Phys. 42 141002
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