Patent ID: 7449686

Claim:
An apparatus for providing tandem mass spectrometric analysis, said apparatus comprising: an ion source for generating ions from a sample; a first ion trap; a second ion trap; an analytical multipole positioned coaxially between said first and second ion traps, configured to selectively filter ions having a mass per charge range outside of a selected mass per charge range out of an ion stream to generate a stream of selected ions having a mass per charge range within said selected mass per charge range; a gate electrode disposed at an exit end of the analytical multipole for selectively trapping ions within the analytical multipole, the gate electrode configured to selectively release said stream of selected ions into said second ion trap; a mass analyzer; a timing sequence for the operation of said analytical multipole, said timing sequence being predetermined based on said selected mass per charge ratio range of; and a switchable power source connected to said analytical multipole.