Abstract

Abstract He+air mixture is a commonly used working gas for cold atmospheric-pressure plasmas (CAPs) because of its good discharge stability and chemical reactivity. However, the internal physical and chemical characteristics, especially the mechanism of the reactive species in low-frequency (LF)-driven He+air CAPs, are not fully understood. Hence, in this study, a global model incorporating 59 species and 866 volume reactions is developed to investigate the species densities and chemical pathways in 50 kHz-driven He+air CAPs with air concentrations ranging from 200 ppm to 5000 ppm. In the entire air content range, O +4 is the most abundant cation, and NO3- is the most abundant anion. HNO2 is the dominant reactive nitrogen species (RNS), and the dominant reactive oxygen species (ROS) changes from H2O2 to O3 when the air concentration increases above 1000 ppm. Moreover, since He+air CAPs are typically driven by low frequency to radio frequency (RF) power sources, in this work, the species densities in LF (f=50 kHz)- and RF (f=13.56 MHz)-driven He+air plasmas are compared. The results show that most species densities in LF-driven He+air plasmas are relatively high, with

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