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Two-photon double ionization of Ne by free-electron laser radiation: a kinematically complete experiment, Kurka, M, Rudenko, A, Foucar, L, Kühnel, K U, Jiang, Y H, Ergler, Th, Havermeier, T, Smolarski, M, Schössler, S, Cole, K, Schöffler, M, Dörner, R, Gensch, M, Düsterer, S, Treusch, R, Fritzsche, S, Grum-Grzhimailo, A N, Gryzlova, E V, Kabachnik, N M, Schröter, C D, Moshammer, R, Ullrich, J
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Курка et al. (2009) studied this question.
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