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Etude des dynamiques moléculaires sondées par générations d'harmoniques d'ordres élevés

Abstract : High harmonic generation (HHG) spectroscopy has proven to be a promisingtool (like probe in pump-probe experiments) in revealing the atomic and molecular dynamicswith the potential for subangstrom spatial resolution and subfemtosecond temporalresolution. Then, rotational dynamics have been resolved on small molecular systems (N2,CO2). This thesis looks to extending HHG spectroscopy methods to probe the structureand the dynamic of complex molecular systems. We will describe the two sources highharmonic generation, the transient grating of excitation and the two-color high harmonicgeneration. We enable to resolve the femtosecond nuclear dynamics in N2O4 and SF6. HHGis also used like a XUV radiation source, playing the role of pump pulse. This approach hasbeen used for the study of photoelectron circular dichroism. An XUV harmonic field witha quasi-circular polarization ionizes chiral molecules. In this manuscript, we will developthis new femtosecond XUV and quasi circular polarization radiation.
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Amelie Ferré. Etude des dynamiques moléculaires sondées par générations d'harmoniques d'ordres élevés. Physique [physics]. Université de Bordeaux, 2014. Français. ⟨NNT : 2014BORD0165⟩. ⟨tel-01145279⟩

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