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Busto, D; Barreau, L; Isinger, M; Turconi, M; Alexandridi, C; Harth, A; Zhong, S; Squibb, R J; Kroon, D; Plogmaker, S; Miranda, M; Jiménez-Galán, Á; Argenti, L; Arnold, C L; Feifel, R; Martín, F; Gisselbrecht, M; L'Huillier, A; Salières, P
Journal of physics. B, Atomic molecular and optical physics/Journal of physics. B, Atomic, molecular and optical physics, 02/2018, Volume: 51, Issue: 4Journal Article
Autoionization, which results from the interference between direct photoionization and photoexcitation to a discrete state decaying to the continuum by configuration interaction, is a well known example of the important role of electron correlation in light-matter interaction. Information on this process can be obtained by studying the spectral, or equivalently, temporal complex amplitude of the ionized electron wave packet. Using an energy-resolved interferometric technique, we measure the spectral amplitude and phase of autoionized wave packets emitted via the sp2+ and sp3+ resonances in helium. These measurements allow us to reconstruct the corresponding temporal profiles by Fourier transform. In addition, applying various time-frequency representations, we observe the build-up of the wave packets in the continuum, monitor the instantaneous frequencies emitted at any time and disentangle the dynamics of the direct and resonant ionization channels.
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