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

Research teams in the lab

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[hal-02156273] Non-adiabatic molecular dynamics investigation of the size dependence of the electronic relaxation in polyacenes  (21/06/2019)  
The Tully's fewest switches surface hopping algorithm is implemented within the framework of the time-dependent density functional based tight binding method (TD-DFTB) to simulate the energy relaxation following absorption of a UV photon by polycyclic aromatic hydrocarbons (PAHs). This approach is used to study the size effect on the ultrafast dynamics in excited states for a special class of PAH species called polyacenes. We determine the dynamical relaxation times and discuss the underlying mechanisms. Our results show that there is a striking alternation in decay times of the brightest singlet state for neutral polyacenes with 3 to 6 aromatic cycles. The alternation corresponds to an order-of-magnitude variation between roughly 10 and 100 fs and is correlated with a qualitatively similar alternation of energy gaps between the brightest state and the state lying just below in energy.

[hal-02153869] Fall-back time for photo-ionized Cs atoms attached to superfluid 4He nanodroplets  (13/06/2019)  
[hal-02129630] Fast quantum control in dissipative systems using dissipationless solutions  (16/05/2019)  
[hal-02128235] Vorticity and quantum turbulence in the merging of superfluid helium nanodroplets  (15/05/2019)  
[hal-02116065] Spontaneous emission of a sodium Rydberg atom close to an optical nanofibre  (17/05/2019)