Nanosecond plasmas in liquids can initiate chemical processes that are exploited in the fields of water treatment, electrolysis or biomedical applications. The understanding of these chemical processes relies on unraveling the dynamics of the variation of pressures, temperatures and species densities during the different stages of plasma ignition and plasma propagation as well as the conversion of the liquid into the plasma state and the gas phase. This is analyzed by monitoring the emission of nanosecond pulsed plasmas that are generated by high voltages of 20 kV and pulse lengths of 10 ns applied to a tungsten tip with 50 μ m diameter immersed in water. The spectra are acquired with a temporal resolution of 2 ns and the emission pattern is modelled by a combination of black body radiation from the hot tungsten tip and the pronounced emission lines of the hydrogen Balmer series. The data indicate two contributions of the hydrogen line radiation that differ with respect to...

中文翻译：

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蒸馏水中的纳秒脉冲放电-第二部分：线发射和等离子体传播

液体中的纳秒等离子体可以引发化学过程，这些化学过程被用于水处理，电解或生物医学应用领域。对这些化学过程的理解依赖于揭示在等离子体点火和等离子体传播的不同阶段以及液体到等离子体状态和气相的转换过程中压力，温度和物质密度变化的动力学。这是通过监视纳秒脉冲等离子体的发射来分析的，纳秒脉冲等离子体的发射是通过将20 kV高压和10 ns脉冲长度施加到浸入水中的直径为50μm的钨尖端上而产生的。光谱以2 ns的时间分辨率获取，并且发射模式通过热钨尖端的黑体辐射与氢Balmer系列的明显发射线的组合进行建模。数据表明氢线辐射的两个贡献相对于...