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Capillary Dielectric Barrier Discharge: Transition from Soft Ionization to Dissociative Plasma
Felix David Klute1, Antje Michels1, Alexander Schütz1
1ISAS-Leibniz Institut für analytische Wissenschaften , Bunsen-Kirchhoff-Str. 11, 44139 Dortmund, Germany.
Analytical Chemistry
|April 2, 2016
Summary
This study shows a helium dielectric barrier discharge plasma can act as both a soft and dissociative ionization source. The plasma
Area of Science:
- Plasma Physics
- Analytical Chemistry
Background:
- Dielectric barrier discharges (DBDs) are versatile plasma sources.
- Understanding plasma behavior is crucial for optimizing analytical techniques.
Purpose of the Study:
- Investigate a capillary helium dielectric barrier discharge (DBD) as a soft or dissociative ionization source.
- Characterize the spatiotemporal evolution of plasma emission.
Main Methods:
- Utilized spatiotemporal measurements of plasma emission.
- Analyzed radiation from helium (He) and nitrogen ions (N2(+)).
- Observed analyte dissociation products.
Main Results:
- Plasma evolved from soft to dissociative ionization within a single voltage duty cycle.
- Soft ionization observed in the plasma jet, characterized by He and N2(+) radiation.
- Dissociative ionization occurred within the capillary electrodes, indicated by dissociation products.
Conclusions:
- Capillary He DBD can be tuned for soft ionization by introducing analytes into the plasma jet.
- The interelectrode plasma is suitable for elemental analysis requiring molecule dissociation.
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