Abstract
The primary fragmentation of diphenyl ether and further secondary dissociation of its fragments have been studied by surface-induced dissociation (SID). In a tandem linear time-of-flight mass spectrometer, the dissociation of ions is studied as a function of the collision energy with a liquid perfluorinated polyether (PFPE) surface. In a tandem quadrupole instrument, an alkyl terminated (C 18) and a perfluoroalkyl terminated (FC 10) self-assembled monolayer surface have been used. The differences in the spectra obtained with the TOF and quadrupole instruments are attributed to the different time frames available for observation of the fragments. Deconvolution of the collision energy resolved SID spectra of diphenyl ether shows that above 50 eV collision energy, the energy deposition efficiency is similar in the two experimental set-ups, in spite of the different geometries. Ion/surface reactions are observed upon collisions of the diphenyl ether radical cation with the C 18 surface but not with the FC 10 surface The rearrangement fragments, obtained from perdeuterated diphenyl ether, C 11D 10 + and C 11D 9 +, react with both the C 18 and FC 10 surface. Hydrogen exchange with the surface combined with hydrocarbon loss from C 12D 10O +, C 11D 10 +, and C 11D 9 + is observed.
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