Institut des Sciences Moléculaires d'Orsay



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Home > Research Teams > Molecular systems, Astrophysics and Environment > Research > Theme 2: Relaxation dynamics of excited molecules

Theme 2: Relaxation dynamics of excited molecules

Photodynamics in the VUV range of molecules of astrophysical relevance

The relaxation of highly-excited electronic states of small molecules is experimentally addressed with a peculiar interest for the dissociation processes consecutive to a VUV photon excitation. Indeed, this process plays a crucial role in various astrophysical environments (planetary atmospheres, comets, circumstellar envelopes of red giant stars,…) where it produces very reactive radical species further involved in complex reaction networks at work in the carbon or nitrogen chemistry of (…)

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Collision-induced molecular dynamics of species of astrophysical relevance

The relaxation of molecules and clusters excited in high velocity collisions with atoms is studied in a close collaboration with researchers at IPNO and Marin Chabot in particular.
The fragmentation of the excited molecules is registered thanks to a dedicated spectrometer, AGAT, located at the Tandem accelerator at IPNO. The collision allows depositing a variable and quite large amount of energy in the molecule, typically in the 5-40 eV domain. The fragmentation of the excited molecules is (…)

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Vibrational and electronic dynamics in large molecular systems

Our research focuses on resolving fundamental physical and chemical processes in medium to large sized molecular system in gas-phase as well as condensed phase using atomistic simulations and dedicated experiments such as monitoring the IR emission of isolated molecules. Systems of interest range from isolated carbohydrate molecules, reactive molecules, clusters, or bio-molecules. Our group focuses on key issue such as the dynamics of carbonaceous molecules in the interstellar medium or (…)

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