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     <dc:title xml:lang="en">Exploring photoswitching pathways in photomagnetic materials with ultrafast optical and X-ray spectroscopies</dc:title>
     <dcterms:alternative xml:lang="fr">Exploration des chemins de photo-commutation dans les matériaux photomagnétiques par spectroscopies ultra-rapides : optique et rayons X</dcterms:alternative>
     <dc:subject xml:lang="fr">Dynamique ultrarapide</dc:subject><dc:subject xml:lang="fr">Solide moléculaire </dc:subject><dc:subject xml:lang="fr">Photomagnétisme </dc:subject><dc:subject xml:lang="fr">Cohérence </dc:subject><dc:subject xml:lang="fr">Transition de spin </dc:subject><dc:subject xml:lang="fr">Transfert de charge</dc:subject>
     <dc:subject xml:lang="en">Ultrafast dynamic</dc:subject><dc:subject xml:lang="en">Molecular solid</dc:subject><dc:subject xml:lang="en">Photomagnetism</dc:subject><dc:subject xml:lang="en">Coherence</dc:subject><dc:subject xml:lang="en">Spin transition</dc:subject><dc:subject xml:lang="en">Charge transfer</dc:subject><tef:sujetRameau><tef:vedetteRameauNomCommun>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="191246050">Photomagnétisme</tef:elementdEntree><tef:subdivision autoriteSource="Sudoc" type="subdivisionDeForme" autoriteExterne="027253139">Thèses et écrits académiques</tef:subdivision>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="027504417">Spectroscopie des rayons X</tef:elementdEntree><tef:subdivision autoriteSource="Sudoc" type="subdivisionDeForme" autoriteExterne="027253139">Thèses et écrits académiques</tef:subdivision>
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     <dcterms:abstract xml:lang="fr">Ce travail de thèse porte sur l’étude de la dynamique femtoseconde de photo-commutation de matériaux moléculaires bistables, à l’aide d’expériences pompe-sonde basées sur les spectroscopies optiques et rayons X. Une partie des expériences a été réalisée sur synchrotron et X-FEL (X-ray Free Electron Laser). La première partie de la thèse, qui est consacrée à l’étude de systèmes à transition de spin non-octaédriques, a révélé différents chemins de transformations sur la surface de potentiel, associés à différents mécanismes de changement d’état électronique et modulant la cohérence de la dynamique structurale pilotant le processus. La seconde partie porte sur l’étude d’analogues du bleu de Prusse (CoFe) où les expériences ultra-rapides ont permis de d’étudier les dynamiques de transformation autour des sites de fer et de cobalt.</dcterms:abstract>
     <dcterms:abstract xml:lang="en">This thesis focuses on the study of the femtosecond photoswitching dynamic in the bistable molecular materials, using the pump-probe experiments which are based on the optical and x-ray spectroscopies.  Part of these experiments was performed at synchrotron and X-FEL (X-ray Free Electron Laser). The first part of the thesis, which is devoted to the study of non-octahedral spin transition systems, revealed different pathways of transformation on the potential surface. The second part focuses on the study of the Prussian Blue Analogues (CoFe), where the ultra-fast experiments allowed to follow the dynamics around the two metal ions.</dcterms:abstract>
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