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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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[hal-03490636] A table-top ultrashort light source in the extreme ultraviolet for circular dichroism experiments

(12/01/2022)  
Circular dichroism in the extreme ultraviolet range is broadly used as a sensitive structural probe of matter, from the molecular photoionization of chiral species1,2,3 to the magnetic properties of solids4. Extending such techniques to the dynamical regime has been a long-standing quest of solid-state physics and physical chemistry, and was only achieved very recently5 thanks to the development of femtosecond circular extreme ultraviolet sources. Only a few large facilities, such as femtosliced synchrotrons6,7 or free-electron lasers8, are currently able to produce such pulses. Here, we propose a new compact and accessible alternative solution: resonant high-order harmonic generation of an elliptical laser pulse. We show that this process, based on a simple optical set-up, delivers bright, coherent, ultrashort, quasi-circular pulses in the extreme ultraviolet. We use this source to measure photoelectron circular dichroism on chiral molecules, opening the route to table-top time-resolved femtosecond and attosecond chiroptical experiments.

[hal-02109685] Conduction mechanisms and voltage drop during field electron emission from diamond needles

(03/11/2021)  

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

(13/12/2021)  

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

(04/01/2022)  

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

(03/11/2021)