A computational modeling study on the helium atmospheric pressure plasma needle discharge
Qian Mu-Yang†a), Yang Cong-Yingb), Liu San-Qiua), Wang Zhen-Donga), Lv Yana), Wang De-Zhenc)
       
Ionization reaction rates distribution at 6.5 ns and 0.2 SLM. (a) Helium related (R3–R6 in Table  3 ), (b) ionization of O2 by electron (R29), (c) Penning ionization of O2 by He* and (R46 and R47), (d) Penning ionization of N2 by He* and (R48 and R49), (e) ionization of N2 by electron (R36), and (f) charge transfer reactions of N2 by He+ and (R50 and R51).