Collision Induced Dissociation of P_n⁺（n=4-25） with Nitrogen

TOF mass spectras of collision induced dissociation of P_n⁺= 4-25) with nitrogen have been recorded on an instrument of tandem time-of-flight mass spectrometer, by direct laser ablation of red phosphorus. It was found that the main collision induced dissociation channel of cluster ions P_n⁺ is P4m’ loss and the small cluster ions（n’=2-8） are formed. The dissociative rule, structural feature, and growth process of the clusters Pn+ have been discussed.