Patent ID: 7064319
Filing Date: 2006-06-20
Classification: H01J

Abstract:
1. A mass spectrometer comprising: an ionization source for generating ions; an ion trap for accumulating said ions, wherein a gas is introduced into said ion trap; a time-of-flight mass spectrometer for performing mass spectrometry analysis on said ions by use of a flight time; a collision damping chamber disposed between said ion trap and said time-of-flight mass spectrometer and having a plurality of electrodes therein which produce a multi-pole electric field, a gas being introduced into said collision damping chamber; and an ion stop electrode provided between said ion trap and said collision damping chamber; wherein a voltage for allowing the passage of ions is applied to said ion stop electrode during a period of ion ejection from said ion trap, and a voltage for blocking the passage of ions is applied to said ion stop electrode during a period of at least one of ion accumulation, ion isolation and ion dissociation in said ion trap so that the ions from said ion trap are prevented from entering into said collision damping chamber; wherein a gas supply mechanism is provided for each of said ion trap and said collision damping chamber.