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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-02073683] Ultrafast electronic relaxations from the S3 state of pyrene

(27/09/2022)  
The ultrafast relaxation occurring in pyrene upon excitation at 4.68 eV was studied in a supersonic gas-jet fs pump-probe experiment. Mass spectrometry and velocity map imaging of photoelectrons produced by probing via multiphoton ionisation at 800 nm reveal that the initially prepared wave packet exhibits a fast relaxation (¡80 fs), followed by a slower one of 200 fs. By comparing the propensity rules of photoionisation observed at one color with ab initio calculations, we tentatively assign these two timescales to a first internal conversion to the dark bB 3g state followed by a second one to the long lived aB 2u first excited state. Vertical excitation energies determined using ab initio Multi-State Complete Active Space 2nd order Perturbation Theory (MS-CASPT2), as well as oscillator strengths between several electronic states, are reported.

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

(04/07/2022)  

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

(04/07/2022)  

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

(04/07/2022)  

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

(04/07/2022)