engleski

Laser plasma interaction with atmospheric pressure plasma jet in contact with liquid water

In this work we present results of characterization of the laser-plasma interactions. We are using atmospheric pressure plasma jet that was characterized in great detail previously [1] and the laser produced plasma [2]. Objective of this research was to investigate plasma-liquid interaction at atmospheric pressure. The plasma jet consists of a glass tube (4 mm or 1 mm inner diameter and 6 mm outer diameter) and metal powered electrode (15 mm wide) placed at 15 mm from the jet nozzle. Power supply of the plasma jet consists of a waveform generator, power amplifier and high voltage transformer and operates at 80 kHz. Deionized water is placed at 15 mm from the jet nozzle. A laser beam (Nd:YAG 1064nm, 5 ns) was focused in the middle between the jet nozzle and the target. We performed optical emission measurements for several gas mixtures (Helium-Argon, Helium- Nitrogen and pure Argon) at flow rates 2 and 4 slm. We also performed time resolved line emission measurements of the laser-jet interaction for the excited 1s3p He state (corresponding to the 388.86 nm line. Interaction of the plasma jet with water surface results in high intensity of NO and OH bands. Composition of the buffer gas has high impact on the concentration of produced radicals. Figure 1. Laser and jet plasma interaction with water surface as grounded electrode the flow rate of 4 slm: a) He/N2 (0.5%) ; b) He/Ar (0.5%) and c) Ar Acknowledgements: This research has been supported by the Ministry of Education and Science Serbia, project III41011 and ON171037, the Croatian Science Foundation project number 2753 and the COST Action TD1208 (Electrical Discharges with Liquids).

laser produced plasma, atmospheric pressure plasma jets

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