Temporal evolution of OH density in a pulse‐modulated surface microdischarge,Plasma Processes and Polymers

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Temporal evolution of OH density in a pulse‐modulated surface microdischarge
Plasma Processes and Polymers ( IF 2.9 ) Pub Date : 2020-09-15 , DOI: 10.1002/ppap.202000122
Zhiwei Wang ₁ , Chunlei Feng ₁ , Liang Gao ₂ , Hongbin Ding ₁

Affiliation

Laser‐induced fluorescence was used to determine the absolute OH density in a pulse‐modulated atmospheric‐pressure surface microdischarge in helium. Measurements were carried out during the discharge and post‐discharge in both plasma layer and downstream region. Experimental findings show that dissipated power, modulation on‐time duration, and the distance from the dielectric surface have more significant effects on the OH(X) lifetime than OH(X) density. The lifetime dependence on power is more pronounced as compared with the modulation duration. Moreover, a dielectric barrier discharge model was presented to estimate the density evolution and loss mechanisms of OH radicals. The results indicate that the decay of OH density is mainly due to the transport process and recombination reactions.

中文翻译：

脉冲调制表面微放电中OH浓度的时间演变

激光诱导的荧光用于确定氦气中脉冲调制的大气压表面微放电中的绝对OH密度。在等离子体层和下游区域的放电和放电后进行测量。实验结果表明，与OH（X）密度相比，耗散功率，调制导通时间和距电介质表面的距离对OH（X）寿命的影响更大。与调制持续时间相比，寿命对功率的依赖性更加明显。此外，提出了介电势垒放电模型以估计OH自由基的密度演化和损失机理。结果表明OH浓度的下降主要是由于运输过程和重组反应。

更新日期：2020-09-15

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