Mass spectrometer

Details Mass spectrometer Mass spectrometer

2005-04-05

2005-04-05

Wells, Nikita (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S281000, C250S282000, C250S286000, C250S287000, C250S288000

Reexamination Certificate

active

06875980

ABSTRACT:
A mass spectrometer is disclosed wherein a relatively energetic pulse of ions having a relatively narrow spread of mass to charge ratios are ejected from a quadrupole ion trap and received in an ion trap upstream of a Time of Flight mass analyser. The ions are collisionally cooled within the ion trap and are pulsed out of the ion trap and into an extraction region of the Time of Flight mass analyser without substantially exciting the ions. This enables improved operation with the Time of Flight mass analyser. According to another embodiment, parent ions are fragmented and the resulting fragment ions are stored in two ion traps having different low mass cut-offs. The trapping system enables MS/MS experiments to be performed with a very high duty cycle.

REFERENCES:
patent: 5399857 (1995-03-01), Doroshenko et al.
patent: 6504148 (2003-01-01), Hager
patent: 6570151 (2003-05-01), Grosshans et al.
patent: 1 367 631 (2003-12-01), None
patent: 11144675 (1997-11-01), None
patent: 11-144675 (1999-05-01), None
patent: WO 9939368 (1999-08-01), None
patent: WO 0115201 (2001-03-01), None

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