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CNRS CNRS 
Contribution of Biogenic VOCs to the formation of secondary organic aerosol (SOA) and free radicals under atmospheric conditions
CNRS, Orleans
ICARE-CNRS
Environmental Science Analytical Chemistry Environmental Chemistry 
Full Description:

Understanding the chemistry of tropospheric aerosols and free radicals is a key for our ability to understand the changes occurring in the atmospheric chemical composition and hence the resulting impacts on air quality and climate change. However, a number of indicators are showing that our knowledge is far from being complete. Over the last years, important findings were made associated either with some unexpected cycling of HOx radicals or with the importance of Criegee Biradicals (CBs) produced during the ozonolysis of unsaturated volatile organic compounds. The CBs may either promptly decompose leading to formation of radicals (OH, RO2) or be collisionaly stabilised and undergo chemical reactions. The reaction of certain CBs with SO2 leading to the H2SO4 formation has been found very recently to be surprisingly fast  and questioning the role of the Criegee biradicals in sulfuric acid formation. Such findings have initiated very intense discussion in the scientific community as they have the potential to drastically affect our understanding of the tropospheric self-cleaning properties.

The purpose of the present PhD thesis is to contribute to a number of laboratory and field studies dealing with atmospheric processes involved in free radicals and secondary aerosol formation. The experimental work will be conducted using the platform HELIOS equipped with state-of-the art techniques (In-situ FTIR, PTR-ToF-MS, Scanning Mobility Particle Sizer (SMPS), nano-SMPS, Aerosol Mass Spectrometer (API-ToF-CIMS), Automatic Thermal Desorption coupled with Gas Chromatography and detection with Mass spectrometry (ATD/GC/MS), …). This platform is the largest
facility in France dedicated to atmospheric chemistry studies. The candidate will collaborate with different laboratories in France, Europe and China.

 



Posted on: 16 June 2015Deadline to apply: 01 August 2015Start Date: 01 October 2015 Duration: 36 months
The Fund category is Public Funding - University and the salary is 15-20k€ annual gross
Doctoral School is Energy - materials - earth and universe sciences in the Centre Region.

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