Diagnostics of atmospheric pressure microplasma with a liquid electrode
Graduate School of Science and Engineering, Saitama
University, 255 Shimo-Okubo,
b Present address: Department of Bioengineering, The University of Tokyo, 113-8656 Tokyo, Japan.
Received: 7 December 2011
Received in final form: 29 February 2012
Published online: 29 June 2012
A rf atmospheric pressure microplasma (APMP) in contact with a liquid electrode is characterized by an optical emission spectroscopy (OES) and a liquid chromatography. The results show that the solution conductivity is the essence for determining the APMP properties rather than the solution pH value. A liquid acidification observed during the APMP treatment is ascribed to the salvation of nitrogen related species created by the APMP. In addition, a typical two-sheath structure of the APMP is revealed by the spatial distribution of OES along the plasma volume. The estimated electron density of the APMP is as high as 1014–1015 cm-3.
Key words: Plasma Physics
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2012