Abstract: A mass spectrometer having an ionization source, a ion trap mass analyzer, an ion guide and gating apparatus between the ion guide and the ion trap. The gating apparatus includes sealing apparatus. A stream of ions from the ion source are guided to through the gating apparatus in pulses to the ion trap. The number of ions in each pulse are controlled by the scaling apparatus.

Abstract: A mass analyzer for isolating, fragmenting and scanning ions. The mass analyzer includes an ion trap having a first electrode, a second electrode adjacent to the first electrode, and a third electrode interposed between the first electrode and the second electrode, a first RF source electrically connected to the first electrode and second electrode and a second RF voltage source electrically connected to the third electrode. The second RF voltage source provides for a second electrical field for fragmenting ions and broadens the potential application of the fragmentation cut-off of the device allowing for analysis of peptides and other complex molecules. The mass analyzer may be used independently or in combination with a mass spectrometry system. A method of ion fragmentation and cut-off is also disclosed.

Abstract: A mass spectrometer having an ionization source, a ion trap mass analyzer, an ion guide and gating apparatus between the ion guide and the ion trap. The gating apparatus includes sealing apparatus. A stream of ions from the ion source are guided to through the gating apparatus in pulses to the ion trap. The number of ions in each pulse are controlled by the scaling apparatus.