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Theses

Matériaux organiques irradiés à très basse température et à différents pouvoirs d'arrêt : cas du polyéthylène et des molécules de cyclohexane isolées en matrice

Abstract : This thesis concerns the formation mechanisms of defects created in organic materials during irradiation under vacuum, at very low temperature and at different electronic stopping powers. Analysis have been realised by infrared spectroscopy. The first part concerns polyethylene. Irradiating at 8 K allows to dissociate the direct irradiation effects (in cage reactions) and the radical recombination effects. According to the considered chemical groups, the radical mobility leads to very different changes for the formation radiochemical yields. The second part concerns the irradiation of cylohexane molecules trapped in a solid argon matrix. We evaluate the contribution of intermolecular and intramolecular reactions. The intermolecular reactions have limited consequences when using low ionising radiations but are crucial for heavy ion irradiations.
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https://tel.archives-ouvertes.fr/tel-00003940
Contributor : Emmanuel Balanzat <>
Submitted on : Tuesday, December 9, 2003 - 7:04:35 PM
Last modification on : Friday, June 28, 2019 - 1:47:20 AM
Long-term archiving on: : Wednesday, November 23, 2016 - 3:47:49 PM

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  • HAL Id : tel-00003940, version 1

Citation

Mickaël Mélot. Matériaux organiques irradiés à très basse température et à différents pouvoirs d'arrêt : cas du polyéthylène et des molécules de cyclohexane isolées en matrice. Matériaux. Université de Caen, 2003. Français. ⟨tel-00003940⟩

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