München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 11: Atmospheric Pressure Plasmas III

P 11.2: Vortrag

Dienstag, 19. März 2019, 14:30–14:45, HS 21

Influence of Atmospheric Compounds on Dielectric Barrier Discharge Ionisation for Mass Spectrometry — •Pascal Vogel¹, Ulrich Marggraf¹, Sebastian Brandt¹, Juan F. Garcìa-Reyes², Constantinos Lazarou³, and Joachim Franzke¹ — ¹ISAS, 44139 Dortmund, Germany — ²Analytical Chemistry Research Group, University of Jaén, Campus Las Lagunillas, 23071 Jaén, Spain — ³Department of Electrical and Computer Engineering, University of Cyprus, Nicosia, 1678, Cyprus

In the field of analytical chemistry, atmospheric pressure plasmas have gained significant interest within the scientific community, because of their advantages according to supplementary equipment: No vacuum system is needed and measurements can be performed under ambient air. This reduces significantly the costs of analytical applications. Different kinds of plasmas have been developed within this field, such as DART, LTP, ACapI, DBDI. There have been different approaches to improve the analytical performance of those discharges, most of them by changing the plasma gas using different kind of dopants such as hydrogen, oxygen or propane. Within these studies, the interaction of the plasma with the surrounding atmosphere is rarely investigated. We will present a newly designed setup to create a controlled atmosphere that directly connects a dielectric barrier discharge to a mass spectrometer. The influence of different gases in the controlled atmosphere on the ionization efficiency and chemistry in the plasma jet will be demonstrated, without changing the plasma gas itself. Analytical benefits will be evaluated.