“…, He þ 2 , He) and 27 reaction channels, with one more species (He ÃÃ ex ) than the simple set. In general, the complicated plasma chemistry includes more reaction channels related to heavy particles, referring to Table 1, such as ion-e recombination [12], ionelectron dissociative recombination [14], ion-electron recombination [15,16], HornbeckMolnar associative ionization [17], metastable-metastable associative ionization [18], metastable-induced dissociative association [22], metastable-induced association [23], dimer-induced dissociative ionization [24], dimer-induced ionization [25] and helium-atom induced dissociation [26].…”