Nitric oxide density distributions in the effluent of an RF argon APPJ: Effect of gas flow rate and substrate

S. Iseni, S. Zhang, A. F.H. Van Gessel, S. Hofmann, B. T.J. Van Ham, S. Reuter, K. D. Weltmann, P. J. Bruggeman

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

The effluent of an RF argon atmospheric pressure plasma jet, the so-called kinpen, is investigated with focus on the nitric-oxide (NO) distribution for laminar and turbulent flow regimes. An additional dry air gas curtain is applied around the plasma effluent to prevent interaction with the ambient humid air. By means of laser-induced fluorescence (LIF) the absolute spatially resolved NO density is measured as well as the rotational temperature and the air concentration. While in the laminar case, the transport of NO is attributed to thermal diffusion; in the turbulent case, turbulent mixing is responsible for air diffusion. Additionally, measurements with a molecular beam mass-spectrometer (MBMS) absolutely calibrated for NO are performed and compared with the LIF measurements. Discrepancies are explained by the contribution of the NO2 and N2O to the MBMS NO signal. Finally, the effect of a conductive substrate in front of the plasma jet on the spatial distribution of NO and air diffusion is also investigated.

Original languageEnglish (US)
Article number123011
JournalNew Journal of Physics
Volume16
DOIs
StatePublished - Dec 2 2014

Keywords

  • atmospheric pressure plasma jets
  • laser induced fluorescence
  • molecular beam mass spectrometry
  • nitric oxide
  • plasma medicine
  • spectroscopy

Fingerprint Dive into the research topics of 'Nitric oxide density distributions in the effluent of an RF argon APPJ: Effect of gas flow rate and substrate'. Together they form a unique fingerprint.

Cite this