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The LCAR (Laboratoire Collisions-Agrégats-Réactivité) is a laboratory centered in fundamental physics organized around two main fields

  1. The study of laser-matter interaction focuses on matter waves studies and strong-field physics
  2. The study of molecular structures and dynamics develops the study and measurement of the properties of clusters, molecules of biological interest, and nano-objects in their environment

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[cea-01244391] Multi-channel electronic and vibrational dynamics in polyatomic resonant high-order harmonic generation

(08/09/2021)  
High-order harmonic generation in polyatomic molecules generally involves multiple channels of ionization. Their relative contribution can be strongly influenced by the presence of resonances, whose assignment remains a major challenge for high-harmonic spectroscopy. Here we present a multi-modal approach for the investigation of unaligned polyatomic molecules, using ​SF6 as an example. We combine methods from extreme-ultraviolet spectroscopy, above-threshold ionization and attosecond metrology. Fragment-resolved above-threshold ionization measurements reveal that strong-field ionization opens at least three channels. A shape resonance in one of them is found to dominate the signal in the 20–26 eV range. This resonance induces a phase jump in the harmonic emission, a switch in the polarization state and different dynamical responses to molecular vibrations. This study demonstrates a method for extending high-harmonic spectroscopy to polyatomic molecules, where complex attosecond dynamics are expected.

[hal-02156273] Non-adiabatic molecular dynamics investigation of the size dependence of the electronic relaxation in polyacenes

(10/05/2021)  

[tel-03205698] Etude expérimentale des interactions du vent solaire avec la molécule prébiotique d'hydantoine (C3N2O2H4)

(26/04/2021)  

[hal-03134247] Fast and robust quantum state transfer in a topological Su-Schrieffer-Heeger chain with next-to-nearest-neighbor interactions

(09/02/2021)  

[tel-03131437] Développement d'une source de condensats de Bose-Einstein pour l'interférométrie atomique

(09/02/2021)