Dynamique réactionnelle de Systèmes Complexes

Abstract : Reaction dynamics is the study of the behaviour of a molecular system, or an ensemble of atomic and molecular systems following a photonic or collisional excitation. These excitations localize differently the deposited energy, and can induce a change in the chemical bonds of the molecule. Independently of the excitation is used, these reactions can be either statistical, or behave in an impulsive character. In this latter case, which is involved in all the rapid dynamics (< 10 ps), the structural modifications of the molecule takes place according to only few molecular coordinates of the excited system. Thus it consists in a direct evolution where the energy is not thermodynamically distributed over all the vibration modes of the molecule. Within the framework of a very fast evolution where only several coordinates are concerned, a complex system can presents an evolution obeying to an extremely simplified model. The goal of the Reaction dynamics is to isolate the main relaxation pathway of the excitation energy.
The objective of this research is to consider systems related to organic chemistry: molecules with a carbon skeleton have been studied (see chapter “Organic Molecules: a step towards organic photochemistry”) and also very reactive intermediates (see chapter “Unsaturated molecules”). Many important reactions take place in a solvent. This is the reason why I studied systems deposited upon argon clusters in order to benefit from the power of the gas phase experiments, allowing the use of a controlled and adjustable solvent (see chapter “Solvation of gas phase systems: Solvent Effects”). I also studied the contribution and behaviour of the electrontric structures of the clusters themselves (see chapter “Pure Clusters Dynamics”) and on model systems (see chapters “Organic Molecules: a step towards Organic Photochemistry” and “Model systems Dynamic”). The evolution of this research program structures my activity and determines my scientific projects.
Document type :
Habilitation à diriger des recherches
Autre. Université Paris Sud - Paris XI, 2008
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  • HAL Id : tel-00290490, version 1


Lionel Poisson. Dynamique réactionnelle de Systèmes Complexes. Autre. Université Paris Sud - Paris XI, 2008. 〈tel-00290490〉



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