New typical ionic clusters with complex anions could be formed directly fro
m the KNO3 aqueous solution by means oi the electrospray ionization mass sp
ectrometry(ESIMS). The difference between the neighboring peaks(m/z), which
corresponded to the molecule weight of KNO3 being 101 in the full mass spe
ctrometry. of the positive-ion and the negative-ion. The general formula of
the ionic clusters belonged to K+(KNO3)(n) and NO3- (KNO3)(m).