Philippe Parent

Activity

surface science, heterogeneous chemistry, environmental chemistry

Themes

I study physical and chemical processes at the surface of environmental solids. I use surface science techniques like photoemission, metastable impact electron spectroscopy, X-ray absorption spectroscopy, surface FT-infrared to understand these processes at the molecular scale. I am particularly interested by the heterogeneous chemistry and photochemistry of atmospheric pollutants such as acids and organic volatile compounds at the surface of water ice. I also work on the homogeneous soft X-ray photochemistry of ice and of small molecules on ice, with application to astrochemistry. My ongoing research focuses on the physical-chemistry of carbonaceous nanoparticles and the development of nanoscience tools in the field of environmental sciences. Follow this link to see a list of my publications  :http://orcid.org/0000-0002-6229-6471?lang=en

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Recherche

-Chemistry and photochemistry of simple molecules in/on water ice:
In many cases the chemical form of gas-phase molecular pollutants is changed upon adsorption on/in water ice. I study these changes using electronic and vibrational spectroscopies (NEXAFS, X/UV photoemission and surface infrared) that provide molecular-scale information on the physical chemistry of the adsorbed species. I work on the heterogeneous chemistry and photochemistry (with simulated solar radiation) of atmospheric species like HCl, organic volatile compounds, and recently HNO₃. I also work on surface chemistry and photochemistry (with synchrotron soft X-rays and laboratory VUV) of reactions relevant to planetary or interstellar ices, like molecular-radical recombination (CO+H, NO+H) at the ice surface, or prebiotic species in ice like amino acids.
-Surface properties of carbonaceous nanoparticles:
Carbonaceous nanoparticles result from carbon combustion. They are ubiquitous in the universe, from the interstellar space medium where they are produced by star combustion, to the Earth’s atmosphere where they come from biomass burning and human activity. I am specifically interested by the role of carbonaceous aerosols released by the air traffic in the Earth’s upper atmosphere, where they activate the ice nucleation that leads to the formation of condensation trails. I use electronic spectroscopies to study the structure and surface chemistry of these carbon nanoparticules - directly collected on real engines or produced at the laboratory, aiming at correlating the ice nucleation process to their physico-chemical properties, and build relevant experimental model surfaces where ice interaction can be directly probe with atomic scale microscopy. This research is done in the frame of the MERMOSE programme (http://mermose.onera.fr/) 

Parcours

-2013- CNRS Directeur de Recherche at the CINaM, Aix-Marseille University, Marseille.
-2005 CNRS Chargé then Directeur de Recherche (2009) at the Laboratoire de Chimie-Physique, Matière et Rayonnement (LCPMR), Université Pierre et Marie Curie, Paris.
-1992 CNRS Chargé de Recherche at the Laboratoire pour l’Utilisation du Rayonnement Electromagnétique (LURE), Orsay.
-1991 Doctorat de Physique de l’Université Pierre et Marie Curie, at the Laboratoire pour l’Utilisation du Rayonnement Electromagnétique (LURE), Orsay, and Saint-Gobain Recherche, Aubervilliers.