Journal of the American Chemical Society, Vol.122, No.40, 9703-9714, 2000
A comparative study of collision-induced and surface-induced dissociation. 1. Fragmentation of protonated dialanine
Collision-induced and surface-induced dissociation of protonated dialanine (Ala-AlaH(+)) was studied using a 7 T Fourier Transform Ion Cyclotron Resonance Mass Spectrometer (FT-ICR MS). Energy-resolved fragmentation efficiency curves were obtained using both techniques. The results were modeled using RRKM/ QET formalism. The energetics and dynamics of the four primary and some secondary fragmentation pathways were determined from the RRKM modeling. Both multiple-collision CID and SID results could be reproduced within the same model. The strong correspondence of fragmentation efficiency curves obtained in the high-pressure CID and SID experiments indicates that the internal energy distributions of Ala-AlaH+ activated by multiple collisions and by surface impact are remarkably similar.