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Abstract: Microwave (MW) torches are typically used to produce equilibrium plasmas for various
industrial applications. We present spectroscopic investigations of atmospheric pressure
afterglow plasmas generated by a Litmas Red MW torch (2.45 GHz, 3 kW) in nitrogen. We
employ optical diagnostics: emission spectroscopy and digital photography to characterise
the plasma jet. Contrary to standard MW torch geometries (where the gas flows upstream
the cavity perpendicular to the MW wave guide), we use special nozzles where the gas is
inserted via two tangential inlets on top of the MW cavity. Plasma produced into the torch
swirls up tangentially through the inlet. We tested several nozzles with different gas inlet
angles and diameters. We present a systematic study of the nitrogen afterglow plasma
jet parameters. Varying MW power and gas flow rates results in varying plasma jet sizes
and properties. The more energy is inserted in the flowing gas, the greater emission and
higher plasma temperatures are obtained. Plasma temperatures are determined from the
CN violet system by comparing experimental and simulated (LIFBASE) spectra. Axial
profiles of the emission intensity and photo–documentation characterise the evolution of
the jet in space. A small admixture of oxygen results in different excited states chemistry,
which was apparent from the emission spectra.
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Citations: | 1.) | Ridenti M.A., Amorim J.: CN (B I-2 Sigma(+) -> X I-2 Sigma(+)) Violet System in a Cold Atmospheric-Pressure Argon Plasma Jet. Plasma Chemistry Plasma Process. 38 (2) 311-329 (2018), WoS, SCOPUS
(2018)
------------- | | 2.) | Lee J.H., Om J.Y., Kim Y.H., Kim K.M., Choi E.H., Kim K.N.: Selective killing effects of cold atmospheric pressure plasma with NO induced dysfunction of epidermal growth factor receptor in oral squamous cellcarcinoma. Plos One 11 (2) e0150279 (2016), WoS, SCOPUS
(2016)
------------- | | 3.) | Nowakowska, H., Jasiński, M., Ḑebicki, P.S. & Mizeraczyk, J. 2011, "Numerical analysis and optimization of power coupling efficiency in waveguide-based microwave plasma source", IEEE Trans. on Plasma Sc., vol. 39, no. 10, pp. 1935-1942. SCOPUS, cit. no. 23
(2011)
------------- | | 4.) | Nakayama, T., Kawahara, N., Tomita, E., Ikeda, Y.: High temporally resolved optical measurement for laser ignition process of laminar premixed mixtures, Trans. Japan Soc. Mech. Engineers, Part B, 74, Issue 7 (2008) 1633-1640, SCOPUS cit. [24]
(2008)
------------- | | 5.) | Jiang, J; Huan, YF; Jin, W; Feng, GD; Fei, Q; Cao, YB; Jin, QH: Development of a high resolution simultaneous microwave plasma torch spectrometer, Spectroscopy and Spectral Analysis 27, 11 (2007) 2375-2379 - SCI cit.
(2007)
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