Conveners
Aerosol
- Claudia Mohr (PSI)
Aerosol particles range typically from a few nanometers to several micrometers in size and have significant impacts on climate, air quality, and health. These particles stem from a wide range of sources and are multicomponent and multiphase in nature. This physicochemical complexity makes it a challenge to assess the particles’ roles in altering atmospheric processes. Scanning transmission...
I will present strategies for highly surface sensitive and chemically sensitive XPS experiments on aerosol samples with atmospherically relevant compositions. I will present results from both inflight and deposited aerosol samples and ambient pressure conditions and discuss atmospheric significance, challenges, and ongoing and planned developments.
The talk will exemplify the unique research opportunities for environmental science using X-ray micro-spectroscopy, scattering and imaging using tender X-ray (2-8~keV). A key challenge for atmospheric research is the sample injection under atmospherically relevant thermodynamic and chemical conditions. The talk will briefly discuss different techniques, their challenges and applicability for...
Our previous work has demonstrated the feasibility of liquid jet XPS for identifying reactive intermediates at the aqueous solution - air interface for solutions in the mM range of concentrations. This establishes a major concentration or water activity gap to atmospheric aerosol particles existing at ambient relative humidity and thus characterized by highly non-ideal conditions. Aerodynamic...
