Laboratoire Francis Perrin
Objectifs Scientifiques
Le Laboratoire Francis Perrin est spécialisé en Chimie Physique. Une grande majorité des travaux porte sur l’interaction des systèmes moléculaires avec la lumière (UV-visible-infrarouge). Ses objectifs s’articulent selon quatre directions qui sont en forte synergie :
- description des processus fondamentaux intervenant dans l’interaction des systèmes moléculaires avec la lumière et, en particulier, ceux qui relèvent de la femtochimie ou sont induits par des effets collectifs (biomolécules, agrégats)
- utilisation de la lumière pour élucider certains processus naturels (repliement des protéines, apparition de mutations cancérigènes…)
- contribution à l’essor des nanosciences et nanotechnologies
- développement des applications dans le domaine de l’environnement, des nouvelles énergies, de la santé...
#177 - Last update : 06/20 2013
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Brief introduction to ion acceleration : Undoubtedly, the acceleration of charged particles has been one of the most active research fields in the physics of laser-matter interaction all along the last ten years. In itself, laser driven ion acceleration was already a well known phenomenon although essentially circumscribed to the thermal expansion of the coronal plasma typical of nano and sub-nanosecond low intensities laser pulses interaction regimes.
Imaging XUV interferometer : Internal conversion frequency imaging interferometer at 32nm
Interferometry allows for getting electronic density information in 2D. For this purpose, we have set up, in collaboration with Attophysic group and LCF-IO, an innovative instrument based on the mutual coherence properties of two High order Harmonic (HHG) from gas jet in the XUV domain. Interferometry, in this wavelength domain, exhibits strong difficulties, due to handling of the beams.
Members of MHDE group : Permanent researchers :
Thomas Blenski
+33 1 69 08 96 64
thomas.blenski@cea.fr
Theory: physic of dense plasmas
Michel Poirier
+33 1 69 08 46 29
michel.poirier@cea.fr
Theory: atomic physic
Frédéric Thais
+33 1 69 08 15 73
frederic.thais@cea.fr
Experiences on high energy lasers and interpretation
PhD students :
Robin Piron
+33 1 69 08 65 14
robin.piron@cea.
Modeling DNA excitons : Modeling DNA excitons
We have modeled the Franck-Condon excited states of DNA duplexes and G-quadruplexes. Our calculations were performed in the frame of the exciton theory combining molecular dynamics simulations (collaboration with Richard Lavery and Krystyna Zakrzewska) and data from quantum chemistry (atomic transition charges for the calculation of dipolar coupling).
MRI constrast agents : The solvation dynamics of complexed metal cations, like liganded gadolinium Gd(III), used as contrast agents in Magnetic resonance Imaging, controls the contrast observed in the MRI images. In this context, the simulation at the molecular level of the dynamical behavior of these species and of their environment (in solution) is crucial for the understanding of the phenomena involved.
Perspectives : Next steps in research on laser driven ion acceleration in Saclay
Relying on a rich set of human resources, technical expertise and equipment, we are going to implement an ambitious program of research.
a) Energy scaling laws
Most of the existing models wich are supposed to give scaling laws about proton beams main features (maximum energy, number of accelerated particles) seem better suited to high-energy and "long" duration (~ ps) laser pulses.
Plasma diagnostic : .....................
Reflectivity measurement in the XUV domain : Spectrally and temporally resolved reflectivity measurement for studying the temporal evolution of a dense plasma of interest for the Warm Dense Matter problematic...
The properties of Warm Dense Matter ( WDM - solid density and temperature of several eV's ) are a subject of strong interest among a wide scientist community ranging from astrophysicists to solid-state physicists.
Transmission measurement in the XUV domain : Temporal evolution of XUV transmission with 100fs resolution for characterizing plasmas created by intense irradiation of thin polypropylene foils.
The plasma is created by intense irradiation (I≈3x1017W/cm2) of thin polypropylene foils, on UHI10 laser facility (CEA-Saclay). The pedestal, which could damages the target before the arrival of the intense part of the laser pulse, has been reduced implementing plasma mirror on the laser system.
