Dr. Peter AlpertPost-Doc
Paul Scherrer Institute
5232 Villigen PSI
Telephone: +41 56 310 3934
Research activities / Special interests
Environmental micro-reactor for atmospheric chemistry and physicsPeter A. Alpert
Organic particles can be highly viscous in air that is dry and cold. Therefore, it is important to quantify limitations of gases through organic materials as a function of temperature and relative humidity to better understand chemical and physical process involving atmospheric aerosol particles. Using state of the art spectro-microscopic techniques at the Swiss Light Source with the development of a new environmental micro-reactor, I investigate molecular diffusion of water vapor, ozone and other reactive gasses through organic particles less than 1 micrometer in diameter. At cold temperatures and low humidity, I expect that chemical reactions are limited to particle surfaces and microphysical processes such as ice nucleation and water condensation are altered.
Diffusion of water vapor and traces gasses within a particle can be limited when a particle becomes highly viscous, typically occurring in dry and cold environments. This can impact processes such as chemical reactions and physical phenomena such as droplet and ice nucleation.