The concentration of OH radicals has been mapped in three-dimensions by scanning planar laser-induced fluorescence (LIF) in the vicinity of surface barrier discharge emerging from liquid water and propagating along a fused silica dielectric tube in argon. The concentration peaked in the region of active discharges near the water level at the value of 1.5 × 10 21 m −3 and decreased with the distance on a characteristic length of ∼0.4 mm, which suggests that the OH transport is dominated by diffusion. The OH production increases with power input ( P ) until it saturates for P > 0.75 W. It has been observed that the repetitive discharge appearance at preferred locations can be changed to stochastic (i.e. macroscopically homogeneous) by increasing the thickness of deionized water covering the earthed electrode.

中文翻译：

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时间和空间分辨LIF测量液态水产生的表面势垒放电所产生的OH自由基的浓度

通过扫描平面激光诱导的荧光（LIF），可以在三维图中绘制OH自由基的浓度，该荧光在液态水产生的表面势垒放电附近并沿着熔融的硅介电管在氩气中传播。浓度在水面附近的活动放电区域达到峰值，浓度为1.5×10 21 m -3，并且随着距离的增加而降低，其特征长度约为0.4 mm，这表明OH的迁移主要由扩散引起。OH的产生随功率输入（P）的增加而增加，直到P> 0.75 W达到饱和为止。已观察到，可以通过增加覆盖在电极上的去离子水的厚度，将优选位置的重复放电外观更改为随机（即，宏观上均匀）。接地电极。