纳秒
SPARK(编程语言)
蛋白质丝
火花放电
跟踪(教育)
流光放电
材料科学
接口(物质)
分析化学(期刊)
纳米技术
光学
化学
物理
等离子体
计算机科学
复合材料
环境化学
物理化学
核物理学
激光器
电极
毛细管作用
程序设计语言
毛细管数
教育学
心理学
作者
Garima Arora,Petr Hoffer,V. Prukner,Petr Bı́lek,Milan Šimek
标识
DOI:10.1088/1361-6595/ad257d
摘要
Abstract The characteristics of nanosecond discharge propagating along the water-air interface in a unique DBD-like configuration with coplanar electrodes submerged in deionized/tap water are studied by combining ultrafast imaging and emission spectra with electrical characteristics. Time-resolved images provide a clear signature of diffusive plasma excited on the water surface at either side of the blade (insulated plastic separating the anode/cathode) called streamer phase and propagating perpendicularly away from it towards the anode /cathode with different velocities. Later on, the diffusive plasma converts into a few discrete and bright plasma filaments due to ionization instability (spark phase). There is no distinctive dependence in the streamer phase on water conductivity, but in the spark phase, more numerous, brighter, and thicker filaments form in tap water. The time-resolved emission spectra reveal the dominance of the first and second positive system of $\mathrm{N_2}$ molecular bands in the streamer phase, followed by the appearance of atomic lines of hydrogen, nitrogen, and oxygen in the spark phase. The emission spectra are utilized to estimate plasma parameters (gas temperature ($T_d$), electric field ($E/N$), and electron density ($n_e$)) where a more dominant spark phase is formed in tap water with $T_d\sim1100$ K, $E/N$ $\sim800$ Td, and $n_e\sim10^{18}$ /$\rm cm^{-3}$.
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