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    EPR analysis of radicals produced by a flowing atmospheric-pressure afterglow

    Author
    Douglass, Luke
    View/Open
    180259_Douglass_rpi_0185N_11738.pdf (1.050Mb)
    Other Contributors
    Shelley, Jacob T., 1984-; Lakshmi, K. V.; McGown, Linda Baine;
    Date Issued
    2020-08
    Subject
    Chemistry
    Degree
    MS;
    Terms of Use
    This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.;
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/20.500.13015/2588
    Abstract
    Electrical discharges are often used as ionization sources for Ambient Desorption/Ionization – Mass Spectrometry (ADI/MS). One such ADI/MS source, the Flowing Atmospheric-Pressure Afterglow (FAPA), has been characterized with a variety of techniques. Excited radical and neutral species produced by the FAPA have been measured using Optical Emission Spectroscopy (OES); however, the afterglow region of the FAPA is difficult to characterize due to how few photons it emits. In order to overcome the limitations of OES, Electron Paramagnetic Resonance (EPR) and a variety of spin-trapping reagents were used to analyze radical and reactive species in the FAPA afterglow. Solutions containing spin-trapping reagents were treated with FAPA over a range of gas flow rates, discharge currents, FAPA-to-sample distances, and plasma treatment times. Several species were detected: O, 1O2, ●OH, H●, a CO2●-. Furthermore, different configurations of FAPA were compared to see which produced a greater abundance of radicals. Ultimately, EPR and spin-trapping reagents were found to be an effective method for the characterization of the afterglow region of FAPA.;
    Description
    August 2020; School of Science
    Department
    Dept. of Chemistry and Chemical Biology;
    Publisher
    Rensselaer Polytechnic Institute, Troy, NY
    Relationships
    Rensselaer Theses and Dissertations Online Collection;
    Access
    Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.;
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