自偶电离

溶剂（不一定是水），产生溶剂合阴离子，溶剂合阳离子的过程
例如：BrF3 + BrF3== BrF4- + BrF2+
NH3+NH3== NH4+ + NH2-
CH3CH2OH+CH3CH2OH== CH3CH2OH2+ + CH3CH2O-
H2O+H2O== H3O+ + OH-
H2SO4+H2SO4(浓)==HSO4- + H3SO4+
H2O2+H2O2==HO2- + H3O2+