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论文类型：期刊论文

发表时间：2013-03-01

发表刊物：IEEE TRANSACTIONS ON PLASMA SCIENCE

收录刊物：SCIE、EI、Scopus

卷号：41

期号：3

页面范围：545-552

ISSN号：0093-3813

关键字：Argon-oxygen plasma jet; density of atomic oxygen and molecular nitrogen; electric field; electron temperature; electronic excitation temperature

摘要：Low-temperature atmospheric-pressure argon-oxygen plasma jet is generated with syringe needle-ring electrodes, which is powered by a sinusoidal excitation voltage at 8 kHz. The volume percentage of the oxygen content in the argon gas is as high as 12.5%. It is found that the rotational temperature of nitrogen is in the range of 297-320 K, and the vibrational temperature is almost unchanged to be about 2475 K, which is obtained by comparing the simulated spectrum with the measured spectrum at the C-3 Pi(u) -> B-3 Pi(g) (Delta v = -2) band transition. The electronic excitation temperature is in the range of 8587-8994 K as obtained by the Boltzmann's plot method, the electron temperature at the tip of syringe needle is about 7.3 eV as estimated by the Einstein's equation, and the densities of atomic oxygen and molecular nitrogen are, respectively, on the order of magnitude of 1016 cm(-3) as determined by actinometry method, respectively. Moreover, the 2-D and 1-D distributions of the electric field magnitude are estimated by the 2-D finite-element software. At a time of 45.7 mu s and an instantaneous applied voltage of 8 kV, the electric field magnitude at the edge of the ring ground electrode is the largest, and it is 15.9 kV/cm at the tip of the syringe needle.