Project Overview

Heterogeneous Photochemistry of Tropospheric Aerosol Particles

Faculty Sponsor

Ephraim Woods (




Secondary organic aerosol, or SOA, forms in the atmosphere through the oxidation of volatile biogenic compounds. The majority of the oxidation mechanisms involve small molecules, such as ozone, in the initial stages of the chemistry. Our group studies the formation of SOA through photochemical mechanisms, where electronically excited molecules play the role of the oxidizing agent. We use a laser-based, ambient pressure photoelectric charging method to monitor the decay of aerosol phase triplet photosensitizer molecules. The results bridge the gap between aerosol phase measurements, which are normally steady-state, and bulk-phase, transient absorption measurements. They also demonstrate how the morphology of particle phase systems can control the chemistry.

Student Qualifications

Students should have a background in chemistry, including topics covered in CHEM 102 or CHEM 111.  Advanced coursework is helpful, but not required. 

Number of Student Researchers

2 students

Project Length

9 weeks

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If you have questions, please contact Karyn Belanger (