This will lead to the enhancement of the energy and concentration of the electron, which will excite CH4 to CHn(n=l-3) and H atoms. The metastable state energy of Ar is 11.55ev.

• Ar的亚稳态能量是11.；55ev，它的存在增加了Ar的电离率，从而使Ar+CH_4中电子浓度提高。