Nanosecond plasmas in liquids are an important method to trigger the water chemistry for electrolysis or for biomedical applications in plasma medicine. The understanding of these chemical processes relies on knowing the variation of the temperatures in these dynamic plasmas. This is analyzed by monitoring nanosecond pulsed plasmas that are generated by high voltages at 20 kV and pulse lengths of 15 ns applied to a tungsten tip with 50 μ m diameter immersed in water. Plasma emission is analyzed by optical emission spectroscopy ranging from UV wavelengths of 250 nm to visible wavelengths of 850 nm at a high temporal resolution of 2 ns. The spectra are dominated by the black body continuum from the hot tungsten surface and line emissions from the hydrogen Balmer series. Typical temperatures from 6000 K up to 8000 K are reached for the tungsten surface corresponding to the boiling temperature of tungsten at varying tungsten vapor pressures. The analysis of the ignition proces...

中文翻译：

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蒸馏水中的纳秒脉冲放电：I.连续辐射和等离子体点火

液体中的纳秒等离子体是触发水化学用于等离子体医学中的电解或生物医学应用的重要方法。对这些化学过程的理解依赖于了解这些动态等离子体中温度的变化。通过监视纳秒级脉冲等离子体进行分析，该等离子体由20 kV的高压和15 ns的脉冲长度施加到直径为50μm的钨尖浸入水中而产生。通过在2 ns的高时间分辨率下从250 nm的UV波长到850 nm的可见波长的光学发射光谱分析等离子体发射。光谱由热钨表面的黑体连续体和氢Balmer系列的谱线发射决定。钨表面达到的典型温度为6000 K至8000 K，对应于在变化的钨蒸气压下钨的沸腾温度。点火过程分析