Two-photon double ionization of Ne by free-electron laser radiation: a kinematically complete experimentстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация: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.