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Spatiotemporal measurement of OH density from upstream to downstream in humid helium atmospheric-pressure plasma jet
Plasma Sources Science and Technology ( IF 3.3 ) Pub Date : 2020-03-11 , DOI: 10.1088/1361-6595/ab3c75
Ryo Ono , Makoto Tokuhiro

The axial distribution and time evolution of OH density from upstream to downstream in He/Halt;subagt;2alt;/subagt;O(10–6000 ppm) atmospheric-pressure plasma jet was measured using laser-induced fluorescence (LIF). The plasma was generated with repetitive positive pulses (7–10 kV, 800 ns, and 1 kHz). We investigated (i) the dependence of OH density on various discharge parameters, (ii) the production and loss processes of OH radicals, and (iii) the effect of Oalt;subagt;2alt;/subagt; admixture on OH density with the help of simulations. The simulations included only postdischarge reactions. To simulate the discharge pulse, the increase in the OH density in a discharge pulse measured using LIF was used as an input parameter. The results suggested that the OH density at any position in the plasma was approximately proportional to alt;iagt;ealt;/iagt;alt;subagt;dalt;/subagt;alt;supagt;0.5alt;/supagt;alt;iagt;falt;/iagt;alt;supagt;0.4alt;/supagt; regardless of the Halt;subagt;2alt;/subagt;O concentration, where alt;iagt;ealt;/iagt;alt;subagt;dalt;/subagt; is the discharge energy density at the position and alt;iagt;falt;/iagt; is the pulse repetition frequency. The results also suggested that OH was mainly produced by Halt;subagt;2alt;/subagt;Oalt;supagt;+alt;/supagt; + e → OH + H rather than Halt;subagt;2alt;/subagt;O + e → OH + H + e, where Halt;subagt;2alt;/subagt;Oalt;supagt;+alt;/supagt; was produced by Penning ionization, and its main loss processes were H + OH +M → Halt;subagt;2alt;/subagt;O +M and OH + OH +M → Halt;subagt;2alt;/subagt;Oalt;subagt;2alt;/subagt; + M.

中文翻译:

湿氦常压等离子体射流中OH密度从上游到下游的时空测量

使用激光诱导荧光 (LIF) 测量 He/Halt;subagt;2alt;/subagt;O(10–6000 ppm) 大气压等离子体射流中 OH 密度从上游到下游的轴向分布和时间演变。等离子体是用重复的正脉冲(7-10 kV、800 ns 和 1 kHz)产生的。我们研究了 (i) OH 密度对各种放电参数的依赖性,(ii) OH 自由基的产生和损失过程,以及 (iii) Oalt;subagt;2alt;/subgt; 的影响。在模拟的帮助下混合 OH 密度。模拟仅包括放电后反应。为了模拟放电脉冲,使用 LIF 测量的放电脉冲中 OH 密度的增加被用作输入参数。结果表明,等离子体中任何位置的 OH 密度与 alt;iagt;ealt;/iagt; 近似成正比。alt;subagt;dalt;/subagt;alt;supagt;0.5alt;/supagt;alt;iagt;falt;/iagt;alt;supagt;0.4alt;/supagt; 无论 Halt;subagt;2alt;/subagt;O 浓度如何,其中 alt;iagt;ealt;/iagt;alt;subagt;dalt;/subagt; 是该位置处的放电能量密度和 alt;iagt;falt;/iagt; 是脉冲重复频率。结果还表明 OH 主要由 Halt;subagt;2alt;/subagt;Oalt;supagt;+alt;/supagt; + e → OH + H 而不是 Halt;subagt;2alt;/subagt;O + e → OH + H + e,其中 Halt;subagt;2alt;/subagt;Oalt;supagt;+alt;/supagt; 由 Penning 电离产生,其主要损失过程为 H + OH +M → Halt;subagt;2alt;/subagt;O +M 和 OH + OH +M → Halt;subagt;2alt;/subagt;Oalt;subagt; 2alt;/subgt; + M。subagt;2alt;/subagt;O 浓度,其中 alt;iagt;ealt;/iagt;alt;subagt;dalt;/subagt; 是该位置处的放电能量密度和 alt;iagt;falt;/iagt; 是脉冲重复频率。结果还表明 OH 主要由 Halt;subagt;2alt;/subagt;Oalt;supagt;+alt;/supagt; + e → OH + H 而不是 Halt;subagt;2alt;/subagt;O + e → OH + H + e,其中 Halt;subagt;2alt;/subagt;Oalt;supagt;+alt;/supagt; 由 Penning 电离产生,其主要损失过程为 H + OH +M → Halt;subagt;2alt;/subagt;O +M 和 OH + OH +M → Halt;subagt;2alt;/subagt;Oalt;subagt; 2alt;/subgt; + M。subagt;2alt;/subagt;O 浓度,其中 alt;iagt;ealt;/iagt;alt;subagt;dalt;/subagt; 是该位置处的放电能量密度和 alt;iagt;falt;/iagt; 是脉冲重复频率。结果还表明 OH 主要由 Halt;subagt;2alt;/subagt;Oalt;supagt;+alt;/supagt; + e → OH + H 而不是 Halt;subagt;2alt;/subagt;O + e → OH + H + e,其中 Halt;subagt;2alt;/subagt;Oalt;supagt;+alt;/supagt; 由潘宁电离产生,其主要损失过程为 H + OH +M → Halt;subagt;2alt;/subagt;O +M 和 OH + OH +M → Halt;subagt;2alt;/subagt;Oalt;subagt; 2alt;/subgt; + M。结果还表明 OH 主要由 Halt;subagt;2alt;/subagt;Oalt;supagt;+alt;/supagt; + e → OH + H 而不是 Halt;subagt;2alt;/subagt;O + e → OH + H + e,其中 Halt;subagt;2alt;/subagt;Oalt;supagt;+alt;/supagt; 由 Penning 电离产生,其主要损失过程为 H + OH +M → Halt;subagt;2alt;/subagt;O +M 和 OH + OH +M → Halt;subagt;2alt;/subagt;Oalt;subagt; 2alt;/subgt; + M。结果还表明 OH 主要由 Halt;subagt;2alt;/subagt;Oalt;supagt;+alt;/supagt; + e → OH + H 而不是 Halt;subagt;2alt;/subagt;O + e → OH + H + e,其中 Halt;subagt;2alt;/subagt;Oalt;supagt;+alt;/supagt; 由 Penning 电离产生,其主要损失过程为 H + OH +M → Halt;subagt;2alt;/subagt;O +M 和 OH + OH +M → Halt;subagt;2alt;/subagt;Oalt;subagt; 2alt;/subgt; + M。
更新日期:2020-03-11
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