Abstract
Tandem mass spectromety data were obtained for relatively high mass precursor ions (< 1500 Da) on a hybrid tandem mass spectrometer with a high maximum zero-to-peak r.f. amplitude in the collision quadrupole, which has been shown to be necessary to focus the high mass product ions through the collision quadrupole. Comparisons are made between these data and those obtained on a tandem magnetic sector instrument. Ion transmission through MS-II of the hybrid instrument varied from 5 to 20% for collision energies of up to 500 eV and a precursor mass of 1219 with maximum transmission occurring at collision energies between 200 and 300 eV. A broad distribution of product ions across the mass range was also observed. Differences are, however, observed between the spectra obtained on the hybrid and on the magnetic sector tandem instruments. Specifically, the low mass fragment ions are enhanced in the hybrid spectra relative to those obtained on the magnetic sector tandem instrument.
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