Analysis of the Ion Conversion Mechanisms in the Effluent of Atmospheric Pressure Plasma Jets in Ar with Admixtures of O2, H2O and Air

Jingkai Jiang, Yolanda Aranda Gonzalvo, Peter J. Bruggeman

Research output: Contribution to journalArticlepeer-review

Abstract

Ionic species in atmospheric pressure plasma jets (APPJs) play an important role in plasma-surface and plasma-liquid interactions, nonetheless, they have not received the same attention as their neutral reactive species counterparts. In this work, a molecular beam mass spectrometer (MBMS) was used to characterize the ion compositions in the effluent of an APPJ operating in ambient air for different feed gases including Ar + O2, Ar + air and Ar + H2O mixtures inspired by gas compositions used for biomedical applications. Changes in compositions of positive and negative ions as a function of nozzle-to-substrate distance along the plasma plume were analyzed and compared with a pseudo-1D plug flow model. Positive and negative ions were detected up to distances of 12 mm from the visible plasma plume tip. The measurements enable to follow the ion conversion pathways in the effluent of the APPJs as a function of distance from the nozzle. The trends in ion yield obtained from a pseudo-1D plug flow model showed generally a good agreement with the experimentally observed trends after addition of ionic reactions to the previously reported reaction set but also some distinctive differences were observed. The dominant positive ions in the far effluent are water ion clusters, the most stable ion for all gas mixtures investigated, while a large variety of negative ions was found for different gas mixtures.

Original languageEnglish (US)
Pages (from-to)1569-1594
Number of pages26
JournalPlasma Chemistry and Plasma Processing
Volume41
Issue number6
DOIs
StatePublished - Aug 13 2021

Bibliographical note

Funding Information:
This material is based upon work supported by the US Department of Energy, Office of Science, Office of Fusion Energy Sciences General Plasma Science program under award number DE-SC0016053 and DE-SC0001939. The authors sincerely thank Prof. M Kushner (University of Michigan) for providing the GLOBALKIN code. The authors acknowledge the Minnesota Supercomputing Institute (MSI) at the University of Minnesota for providing resources that contributed to the results reported in this paper.

Funding Information:
This material is based upon work supported by the US Department of Energy, Office of Science, Office of Fusion Energy Sciences General Plasma Science program under award number DE-SC0016053 and DE-SC0001939. The authors sincerely thank Prof. M Kushner (University of Michigan) for providing the GLOBALKIN code. The authors acknowledge the Minnesota Supercomputing Institute (MSI) at the University of Minnesota for providing resources that contributed to the results reported in this paper.

Publisher Copyright:
© 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

Keywords

  • APPJ
  • Ion conversion
  • Molecular beam mass spectrometer
  • Plug flow modelling

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