Abstract
Solving the time-dependent Schr\odinger equation in full dimensionality for two electrons, it is found that in the XUV regime the two-photon double ionization dynamics of He($1s2s$) is predominantly dictated by the process of resonance enhanced multiphoton ionization via doubly excited states (DESs). We have studied a pump-probe scenario where the full laser-driven breakup of the ${}^{3}S$ $1s2s$ metastable state is dominated by intermediate quasiresonant excitation to doubly excited (autoionizing) states in the ${}^{3}{P}^{o}$ series. Clear evidence of multipath interference effects is revealed in the resulting angular distributions of the ejected electrons in cases where more than one intermediate DES is populated in the process.
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