Exploring availability of plasma-induced solvated electrons: formation and transport

该项目创新地提出了液体中的等离子体流作为溶剂化电子的潜在高效源。为了阐明溶剂化电子与等离子体流动之间的耦合机制，由于溶剂化电子的超活性和短寿命，直接观察溶剂化电子是一个严峻的挑战。在fy2022实验中选择脱氯作为溶剂化电子的指标。结果证实了氯离子的生成，氯离子保留在目标溶液中，随着处理时间的增加，其可用质量浓度最终呈指数增长。这些结果验证了通过特定指标监测溶液中溶剂化分布的潜力。下一步，将研究和讨论由浓度差异引起的流动行为。将条纹相机与光谱仪相结合，可以将等离子体流的光谱特征分解为连续时间序列。成功地获得了气液界面的时间分辨光谱，时间分辨小于1微秒，波长分辨为5.3 nm。可以识别出两个主要的光发射波段，分别对应于电压施加和反向的瞬间。两个波段的波长含量没有差异，但总强度和宽度变化明显。结果强调了溶剂化电子来自等离子体流动的起源，而不是液体中电荷的积累。

This project innovatively proposes the plasma flow in the liquid as a potential high-effective source for solvated electrons. In order to elucidate the coupling mechanism between solvated electrons and plasma flow, it is a severe challenge to directly observe solvated electrons due to the super activity and short lifetime of solvated electrons. In FY 2022, dechlorination was selected as an indicator of solvated electrons in the experiment. The results confirm the generation of chloride ions which remained in the target solution with a useable mass concentration that eventually increases exponentially when the treatment time increase. These results validate the potential for monitoring the distribution of solvated in the solution by specific indicators. In the next step, the flow behavior caused by the concertation difference would be studied and discussed.By combining a streak camera and a spectrometer, it is possible to resolve the spectral characteristics of plasma flow into continuous time sequences. The time-resolved spectra at the gas-liquid interface were successfully achieved with a temporal resolution of less than 1 microsecond and a wavelength resolution of 5.3 nm. Two main bands of light emission can be recognized, which correspond to the instants of the voltage application and reverse. The contents of wavelengths for the two bands show no difference, however, the total intensity, as well as the width, changes significantly. The results highlight the origin of the solvated electrons from plasma flow rather than the accumulation of charge in the liquid.