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Institut des Sciences Moléculaires d'Orsay

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Accueil > Séminaires > Année 2022 > Séminaire de Constant Schouder (27 sept)

Séminaire de Constant Schouder (27 sept)

LIDYL, CEA, CNRS, Paris-Saclay

par Martrenchard-Barra Séverine - 1er septembre 2022


Le séminaire aura lieu dans l’amphi du bât 520 et sera également diffusé en visioconférence. Les personnes extérieures au laboratoire qui souhaitent disposer du lien sont invitées à envoyer un mail à l’adresse

seminaires.ismo@universite-paris-saclay.fr

Elles recevront le lien pour se connecter en retour.

Solvation dynamics and complex formation in helium nanodroplets

Complexes of molecules and/or atoms held together by weak noncovalent interactions are ubiquitous in the natural sciences. Cryomatrix and supersonic expansion are now the most prominent techniques to study them. Among the cryomatrices, helium nanodroplet, thanks to its superfluid character, is one of the most fruitful environments for their study and their formation [1]. In particular, the helium atoms are completely transparent in the entire spectral range from the far IR to the vacuum UV permitting the study of most molecular systems without affecting the solvent.

In this talk, I will show some results obtained in Aarhus university using fs-laser source and ion velocity map imaging. I will first highlight the ability to form complexes embedded in helium nanodroplets or sitting on their surface. I will show how to study their rotational dynamics and how to infer structural information using Coulomb explosion imaging [2,3]. Moreover, I will present a new developed technique that permits to follow the solvation dynamics of an alkali ion sitting on the surface of a helium nanodroplet.

[1] Toennies, J.P. and Vilesov, A.F. (2004), Superfluid Helium Droplets : A Uniquely Cold Nanomatrix for Molecules and Molecular Complexes. Angewandte Chemie International Edition, 43 : 2622-2648. https://doi.org/10.1002/anie.200300611
[2] Constant Schouder, Adam S. Chatterley, Florent Calvo, Lars Christiansen, and Henrik Stapelfeldt , "Structure determination of the tetracene dimer in helium nanodroplets using femtosecond strong-field ionization", Structural Dynamics 6, 044301 (2019) https://doi.org/10.1063/1.5118005
[3] Constant Schouder et al 2021 J. Phys. B : At. Mol. Opt. Phys. 54 184001

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