The application of low energy photon ionization to heterogeneous aerosol chemistry Public Deposited

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Last Modified
  • March 21, 2019
Creator
  • Nash, David Gerald.
    • Affiliation: College of Arts and Sciences, Department of Chemistry
Abstract
  • The first part of this dissertation is a review of developments made in the field of aerosol mass spectrometry. The focus of the research is on the reduction of fragmentation observed in the mass spectra of organic molecules and its application to studying the reactivity of more realistic aerosol particles. Initial studies examined reduction in oleic acid fragmentation with lower energy (8.75 eV) photons generated using resonance difference frequency mixing (RDFM), a form of four wave mixing. In the same study, the effects of different particle vaporization methods on the ion production mechanism are discussed. Understanding both of these issues is very important to accurate kinetics studies. These findings were then applied to the study of the reactivity of mixed myristic acid/oleic acid particles. While still not as complex as typical atmospheric particles, studying particles consisting of a binary mixture, especially the ones studied here which can undergo phase changes with changing relative composition is an important first step in understanding issues such as why the lifetime of oleic acid as measured in the field is longer than what would be predicted from laboratory studies. Our study of mixed particles demonstrates reduced reactivity upon crystallization of myristic acid. Possibilities for the way in which crystallization would have to occur to result in the observed degree of decreased reactivity are also discussed.
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  • In Copyright
Advisor
  • Baer, Tomas
Degree granting institution
  • University of North Carolina at Chapel Hill
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  • Open access
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