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

S. Iseni (1, 2) , S. Zhang (3) , a F H Van Gessel (3) , S. Hofmann (3) , B T J Van Ham (3) , S. Reuter (2, 1) , Klaus Dieter Weltmann (1) , P J Bruggeman (3, 4)

1 INP - Leibniz Institute for Plasma Science and Technology
2 The center for innovation competence (ZIK) plasmatis
3 Department of Applied Physics [Eindhoven]
4 UMN - University of Minnesota [Twin Cities]

The effluent of an RF argon atmospheric pressure plasma jet, the so-called kinpen, is investigated\\r 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\\r ambient humid air. By means of laser-induced fluorescence (LIF) the absolute spatially resolved NOr density is measured as well as the rotational temperature and the air concentration. While in ther 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.

Mots clés: plasma medicine; [atmospheric pressure plasma jets; atmospheric pressure plasma jets; laser induced f; laser induced fluorescence; molecular beam mass spectrometry; nitric oxide; spectroscopy

Domaines: Physique des plasmas [physics.plasm-ph]

S. Iseni, S. Zhang, a F H Van Gessel, S. Hofmann, B T J Van Ham, et al.. Nitric oxide density distributions in the effluent of an RF argon APPJ: effect of gas flow rate and substrate. New Journal of Physics, 2014, 16 (12), pp.123011--123011. ⟨10.1088/1367-2630/16/12/123011⟩. ⟨hal-02270226⟩