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- W2969641574 abstract "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." @default.
- W2969641574 created "2019-08-29" @default.
- W2969641574 creator A5022699919 @default.
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- W2969641574 date "2020-03-11" @default.
- W2969641574 modified "2023-10-10" @default.
- W2969641574 title "Spatiotemporal measurement of OH density from upstream to downstream in humid helium atmospheric-pressure plasma jet" @default.
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- W2969641574 doi "https://doi.org/10.1088/1361-6595/ab3c75" @default.
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