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Indexed by:期刊论文

Date of Publication:2013-08-01

Journal:SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY

Included Journals:SCIE、EI、PubMed

Volume:112

Page Number:223-227

ISSN No.:1386-1425

Key Words:Dielectric material; Nanosecond pulse; Diffuse dielectric barrier discharge; Optical emission spectra; Atmospheric pressure

Abstract:In this paper, dielectric plates made by ceramic, quartz and polytetrafiuoroethylene (PTFE) respectively are employed to generate low gas temperature, diffuse dielectric barrier discharge plasma by using a needle-plate electrode configuration in air at atmospheric pressure. Both discharge images and the optical emission spectra are obtained while ceramic, quartz and PTFE are used as dielectric material. Plasma gas temperature is also calculated by comparing the experimental emission spectra with the best fitted spectra of N-2 (C-3 Pi(u ->) B-3 Pi(g) 1-3) and N-2 (c(3)Pi u B-3 Pi(g) 0-2). The effects of different pulse peak voltages and gas gap distances on the emission intensity of N-2 (C-3 Pi(u,) B-3 Pi(u)-> 0-0,337.1 nm) and the plasma area on dielectric surface are investigated while ceramic, quartz and PTFE are used as dielectric material. It is found that the permittivity of dielectric material plays an important role in the discharge homogeneity,.plasma gas temperature, emission spectra intensity of the discharge, etc. Dielectric with higher permittivity i.e., ceramic means brighter discharge luminosity and stronger emission spectra intensity of N-2 (c(3)Pi(u), B-3 Pi(g), 0-0, 337.1 nm) among the three dielectric materials. However, more homogeneous, larger plasma area on dielectric surface and lower plasma gas temperature can be obtained under dielectric with lower permittivity i.e., PTFE. The emission spectra intensity and plasma gas temperature of the discharge while the dielectric plate is made by quartz are smaller than that while ceramic is used as dielectric material and bigger than that when PTFE is used as dielectric material. (C) 2013 Elsevier B.V. All rights reserved.