Lee Tiszenkel

Date of Award


Document Type


Degree Name

Master of Science (MS)


Atmospheric Science

Committee Chair

Shanhu Lee

Committee Member

Kevin Knupp

Committee Member

Arastoo Pour Biazar


Nucleation., Particles., Aerosols., Sulfuric acid.


New particle formation (NPF) consists of two steps: nucleation and growth. At present, mechanisms governing these processes are not well understood. Here, we report results obtained from the TANGENT (Tandem Aerosol Nucleation and Growth Environment Tube) experiments. The TANGENT apparatus enables us to study these processes independently. Our results show that lower temperatures enhance both the nucleation and growth rate of sulfuric acid particles. However, at temperatures below 268 K the effects of temperature on the nucleation rate become less significant, indicating that particle formation takes place via barrierless nucleation at lower temperatures. We examined the growth of newly formed particles under differing temperature conditions for nucleation and growth. Our results show that newly nucleated clusters formed at low temperatures can survive evaporation and grow in a warmer environment in the presence of SO2 and ozone, implying that some heterogeneous reactions involving nanoparticles affect their growth.



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