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On the Active Species Concentrations of Atmospheric Pressure Nonequilibrium Plasma Jets

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2 Author(s)
Xinpei Lu ; State key laboratory of advanced electromagnetic engineering and technology, Huazhong University of Science and Technology, Wuhan, China ; Shuqun Wu

Atmospheric pressure nonequilibrium plasma jets (APNP-Js), which generate plasma in open space rather than in a confined discharge gap, are recently a topic of great interest. However, researchers actually know little about the bright plasma plume in the beginning. Fortunately, after about one decade of researches, the main active species concentrations of APNP-Js are measured. Although the measurements are carried out for different plasma jet devices and under different experimental conditions, it still gives us some insight information about the plasma plumes. In this paper, the measurements on the concentrations of the main active species such as electron, O atom, OH, {\rm O}_{2}(^{1}\Delta _{g}) , metastable state He and Ar, nitric oxide (NO), metastable state {\rm N}_{2}({\rm A}^{3}\Sigma _{u}^{+}) , and N atom for different experimental conditions are reviewed. The peak electron density of a microplasma plume could reach in the order of 10^{14}~{\rm cm}^{-3} . The O atom density is in the order 10^{14}~{\rm cm}^{-3} in the plasma plume but it is in the order 10^{16}~{\rm cm}^{-3} inside the discharge gap. The OH and {\rm O}_{2}(^{1}\Delta _{g}) densities are in the order of 10^{15}~{\rm cm}^{-3} . The metastable state He and Ar concentrations could reach the order of 10^{11} and 10^{12}~{\rm cm}^{-3} , respectively. The NO density is in the order of 10^{15}~{\rm cm}^{-3} in the plasma plume. It should be emphasized that all the measurements are carried out under different experimental conditions and for different experimental setups.

Published in:

IEEE Transactions on Plasma Science  (Volume:41 ,  Issue: 8 )