Étude de dynamiques de photoionisation résonante à l'aide d'impulsions attosecondes

Abstract : In this work, photoionzation of atomic and molecular species in the gas phase is investigated with high-harmonic radiation. In a first part, electronic dynamics in the autoionization process of rare gases in studied with electron interferometry. This method gives access to the spectral phase of the transition to the autoionizing state, and allows there construction of the entire autoionization dynamics. The ultrafast electronic dynamics, as well as the build-up of the celebrated asymmetric Fano profile, are observed experimentally for the first time. In a second part, photoionization of NO molecules in the molecular frame is used as a polarimeter to completeley characterize the polarization state of high-harmonics. In particular, this method can address the challenging disentanglement of the circular and unpolarized components of the light. The experimental results, completed by numerical simulations, allow defining optimal generation conditions of fully circularly-polarized harmonics for advanced studies of ultrafast dichroisms in matte
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Lou Barreau. Étude de dynamiques de photoionisation résonante à l'aide d'impulsions attosecondes. Physique Atomique [physics.atom-ph]. Université Paris-Saclay, 2017. Français. ⟨NNT : 2017SACLS511⟩. ⟨tel-01686442v2⟩

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