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

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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.