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Open Chemistry

formerly Central European Journal of Chemistry

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Volume 13, Issue 1


Volume 13 (2015)

Time resolved optical emission spectroscopy in power modulated atmospheric pressure plasma jet

Jaroslav Hnilica
  • Corresponding author
  • Masaryk University, Department of Physical Electronics Kotlářská 2, CZ-61137 Brno, Czech Republic
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Lucia Potočňáková
  • Masaryk University, Department of Physical Electronics Kotlářská 2, CZ-61137 Brno, Czech Republic
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Vít Kudrle
  • Masaryk University, Department of Physical Electronics Kotlářská 2, CZ-61137 Brno, Czech Republic
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2014-12-22 | DOI: https://doi.org/10.1515/chem-2015-0070


In this paper, the effects of the power modulation on atmospheric pressure plasma jet, operated in Ar+2%N2 mixture, are studied. Time resolved optical emission spectroscopy is used for the investigation. From line and band intensities, the excitation, vibration and rotation temperatures are calculated. Their evolution during the modulation period exhibits a strong dependence on modulation frequency. For higher modulation frequencies, there is significant discrepancy in rotational temperatures calculated from OH spectra and from N2+ spectra, which indicates that thermalisation time can reach milliseconds.

Graphical Abstract

Keywords : plasma jet; amplitude modulation; rotational temperature; emission spectroscopy


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About the article

Received: 2014-01-16

Accepted: 2014-05-29

Published Online: 2014-12-22

Citation Information: Open Chemistry, Volume 13, Issue 1, ISSN (Online) 2391-5420, DOI: https://doi.org/10.1515/chem-2015-0070.

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© 2015 Jaroslav Hnilica et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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