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Abstract by Daniel Thurston

Personal Infomation

Presenter's Name

Daniel Thurston

Degree Level



Charlotte Lewis
Joachim Franzke

Abstract Infomation


Chemistry and Biochemistry

Faculty Advisor

Paul Farnsworth


Using Absorption and Emission Imaging to Measure the Spatial Distribution of Key Excited Species in a Dielectric Barrier Discharge


Helium metastable atoms are among the key energetic species in plasma-based ambient desorption/ionization (ADI) sources, and an understanding of where and when they are produced is essential in developing an effective model of how ADI sources function. We are producing time- and space-resolved maps of He metastable atom densities, as well as other excited species including N2, N2+, and O in a miniature dielectric barrier discharge used as an ADI source. For emission measurements, the discharge is mounted in front of a spectrograph with an intensified gated charge coupled device (CCD) as a detector. The gated detector records time- and space-resolved emission intensities. For He metastable absorbance measurements, laser light at 1083 nm is focused through the plasma and into a detector. The combined emission and absorbance and emission data map the spatial distributions of key species in the plasma. These measurements of key energetic species will be used to develop a more accurate model for the behavior of ADI sources. The model will serve as a basis for the development of improved sources.