Direct Current Atmospheric Pressure Microdischarge Generated between a Miniature Flow Helium Microjet and a Flowing Liquid Cathode

作者：Jamroz Piotr^*; Greda Krzysztof; Pohl Pawel

来源：Plasma Processes and Polymers, 2014, 11(8): 755-762.

DOI：10.1002/ppap.201400012

• atmospheric pressure glow discharge
• discharge-liquid interaction
• gas microjet
• optical emission spectrometry
• spectroscopic diagnostics

A new miniaturized direct current atmospheric pressure glow microdischarge system (dc-mu APGD) was studied. The discharge was generated in the open-to-air atmosphere between a miniature flow He microjet and a small-sized flowing liquid cathode of a new compact design. Optical temperatures (rotational, vibrational, and excitation) were determined for the near liquid cathode zone of the microdischarge under conditions of a changing flow rate of He (30-300 sccm). Both, the rotational temperature of OH (2 800-3 850 K) and N-2 (1 550-1 900 K) molecules, and the vibrational temperature of OH (2 900-4 000 K) and N-2 (3 800-4 200 K) molecules were lower than the excitation temperature of H atoms (4 400-4 600 K). The electron number density determined in these conditions was within the range of (2.0-3.5) x 10(14) cm(-3). Additionally, concentrations of nitrate, nitrite, and ammonium ions as well as hydrogen peroxide were quantified in the solution of the flowing liquid cathode treated by the studied microdischarge. Changes in the acidity of this solution were also examined.

• 出版日期2014-8