C-60 AS MODEL-COMPOUND FOR LARGE CARBON CLUSTER ION EVAPORATIONS

High-resolution experiments were performed on a hybrid triple-stage mass spectrometer of BEqQ(B = magnet, E = electric sector, gQ = two-stage quadrupole) geometry to study the general influence of interferences in the daughter ion spectra which result from unimolecular dissociations of large carbon cluster ions. Due to its large but defined size, C60 has been used as a particularly suitable model compound for these investigations. It is shown that the presence and origin of these interference signals can be established with a special MS/MS/MS type technique. This technique involves the measurement of MIKE (mass-analyzed ion kinetic energy) spectra of mass-resolved daughter ions.