Behaviour of atomic oxygen in a pulsed dielectric barrier discharge measured by laser-induced fluorescence
Behaviour of atomic oxygen in a pulsed dielectric barrier discharge measured by laser-induced fluorescence
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DOI：
10.1088/0022-3727/38/16/011
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发表时间：
2005-08
期刊：
影响因子：
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通讯作者：
R. Ono;Youta Yamashita;K. Takezawa;T. Oda
中科院分区：
文献类型：
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作者：
R. Ono;Youta Yamashita;K. Takezawa;T. Oda
利用双光子吸收激光诱导荧光(TALIF)测量了脉冲介质阻挡放电(DBD)中的原子氧。在226 nm处，基态原子氧被双光子吸收激发到3p~3p态。在大气压下，O2-N_2混合气中出现负(−)40千伏或正(+30千伏)脉冲DBD。DBD电流的脉冲宽度约为50 ns。Talif实验表明，原子氧的衰变速率随O2浓度的增加而线性增加。结果表明，氧的衰变主要是通过第三体反应，O+O2+M→O_3+M。第三体反应的速率系数在负DBD中为2.2×10−34CM6 S−1，在正DBD中为0.89×10−34CM6 S−1。结果表明，原子氧的衰减率随湿度的增加而线性增加。这可以解释众所周知的事实，即DBD中的臭氧产生受到湿度增加的抑制。
Atomic oxygen is measured in a pulsed dielectric barrier discharge (DBD) using two-photon absorption laser-induced fluorescence (TALIF). The ground-level atomic oxygen is excited to the 3p 3P state by two-photon absorption at 226 nm. Negative (−40 kV) or positive (+30 kV) pulsed DBD occurs in an O2–N2 mixture at atmospheric pressure. The pulse width of the DBD current is approximately 50 ns. The TALIF experiment shows that the decay rate of atomic oxygen increases linearly with O2 concentration. This result proves that atomic oxygen decays mainly by the third-body reaction, O + O2 + M → O3 + M. The rate coefficient of the third-body reaction is estimated to be 2.2 × 10−34 cm6 s−1 in the negative DBD and 0.89 × 10−34 cm6 s−1 in the positive DBD. It is shown that the decay rate of atomic oxygen increases linearly with humidity. This can explain the well-known fact that ozone production in DBD is suppressed by increasing humidity.