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论文类型：期刊论文

发表时间：2011-09-01

发表刊物：SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY

收录刊物：Scopus、SCIE、EI、PubMed

卷号：79

期号：5

页面范围：1896-1903

ISSN号：1386-1425

关键字：Diffuse bi-directional pulsed discharge; Nanosecond pulse; Dielectric barrier discharge; Optical emission spectra; Atmospheric pressure

摘要：In this study, a bi-directional high voltage pulse with 20 ns rising time is employed to generate diffuse glow-like dielectric barrier discharge plasma with very low gas temperature in N(2) using needle-plate electrode configuration at atmospheric pressure. Both the diffuse nanosecond pulsed dielectric barrier discharge images and the optical emission spectra of the discharge are recorded successfully under severe electromagnetic interference. The effects of pulse peak voltage, pulse repetition rate, and the concentrations of Ar and O(2) on the emission intensities of NO (A(2)Sigma -> X(2)Pi), OH (A(2)Sigma -> X(2)Pi, 0-0), N(2) (C(3)Pi(u) -> B(3)Pi(g), 0-0, 337.1 nm), and N(2)(+) (B(2)Sigma(+)(u) -> X(2)Sigma(+)(g), 0-0, 391.4 nm) are investigated. The effects of the concentrations of Ar and O(2) on the discharge diffuse performance are also studied. It is found that the emission intensities of NO (A(2)Sigma -> X(2)Pi), OH (A(2)Sigma -> X(2)Pi, 0-0), N(2) (C(3)Pi(u) -> B(3)Pi(g), 0-0, 337.1 nm), and N(2)(+) (B(2)Sigma(+)(u) -> X(2)Sigma(+)(g), 0-0, 391.4 nm) rise with increasing pulse peak voltage, pulse repetition rate, and the concentration of Ar, but decrease with increasing the concentration of O(2). The main physicochemical processes involved are also discussed. (C) 2011 Elsevier B.V. All rights reserved.