Surface-induced dissociation of molecular ions

Autor: Md. A. Mabud, Michael J. Dekrey, R. Graham Cooks
Rok vydání: 1985
Předmět:
Zdroj: International Journal of Mass Spectrometry and Ion Processes. 67:285-294
ISSN: 0168-1176
DOI: 10.1016/0168-1176(85)83024-x
Popis: Fragmentation of polyatomic ions upon collision with a metal surface was studied using a modified hybrid mass spectrometer. Daughter spectra of mass-analyzed parentions obtained upon collision with both solid and gaseous targets are compared. As in conventional gas-phase collisions, the extent of fragmentation in surface-induced dissociation (SID) is observed to depend strongly upon the collision energy chosen. Thus, experiments in which the collision energy is varied give energy-resolved mass spectra (ERMS) which correspond to those observed in the analogous gas-phase experiments. While both methods of activation display the same fragment ions, significant differences in the amount of energy deposited are observed between the two methods. At low collision energy, SID gives essentially no dissociation. On the other hand, selection of higher collision energies can result in deposition of even larger amounts of internal energy than are available from the comparable gas-phase collisional processes at either low (eV) or high (keV) energy.
Databáze: OpenAIRE