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Dynamique ultrarapide corrélée : théorie, simulations et interprétations d'expériences de spectroscopie "attoseconde"

Abstract : The main topic of this thesis is the subfemtosecond study of correlations during the photoionisation dynamics of atoms and molecules. First, we observe vibronic correlations on asymmetric ionisation of diatomic molecules. Solving the time-dependent Schrödinger equation numerically, we are able to highlight the influence of photoelectron-nuclei energy exchange on such processes. Moreover, we have developped a stationary approach enabling to retrieve those results, and to define a specific optimal geometry for each vibrational channel. Such an approach is tested for various model molecules, involving charge or mass asymmetry. We finally compare and establish the link between two-photons interferometric measurement simulations to one-photon results. Besides, we also study the photoionisation dynamics through a Fano resonance, using a multichannel model developped for this work. The time-dependent built-up of the photoelectron spectrum enables us to validate experimental interpretations conjectured in CEA Saclay group. We show how robust is this conjecture, et go further into details by highlighting the influence of probe pulse on the dynamics.
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Antoine Desrier. Dynamique ultrarapide corrélée : théorie, simulations et interprétations d'expériences de spectroscopie "attoseconde". Chimie théorique et/ou physique. Sorbonne Université, 2018. Français. ⟨NNT : 2018SORUS494⟩. ⟨tel-02612238⟩

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