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Water in atmospheric-pressure helium rf plasmas

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conference contribution
posted on 2014-09-15, 13:35 authored by Felipe IzaFelipe Iza
Radio frequency (rf) plasmas operated at atmospheric pressure have received great attention in recent years for their potential use in many scientific and industrial applications. The optical emission profile of these atmospheric pressure rf discharges typically presents two bright layers, one above each of the electrodes. Although in the low-pressure regime bright layers near the electrodes are typically associated with the so-called gamma mode, these layers are observed in the alpha mode at atmospheric pressure and only after a significant increase in current, the transition into the gamma mode takes place. In the gamma mode, the bright layers are found to light up in an alternating fashion, corresponding to the excitation of radiative states by avalanches across the sheaths. On the other hand, in the alpha mode, the bright layers light up simultaneously mostly as a result of the acceleration of bulk electrons in the expanding and retreating sheathbulk boundaries.


This work was supported by the UK Engineering Physical Science Research Council.



  • Mechanical, Electrical and Manufacturing Engineering

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The 9th EU-Japan Joint Symposium on Plasma Processing (JSPP2014)


Tue. 21. Jan @ 15:15 - ? (2)


IZA, F., 2014. Water in atmospheric-pressure helium rf plasmas. Presented at: The 9th EU-Japan Joint Symposium on Plasma Processing (JSPP2014) and EU COST MP1101 Workshop on Atmospheric Plasma Processes and Sources, 19th-23rd January 2014, Bohinjska Bistrica, Slovenia.


  • AM (Accepted Manuscript)

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This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

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Bohinjska Bistrica, Slovenia

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