Patent ID: 6797949
Filing Date: 2004-09-28
Classification: H01J

Abstract:
A mass spectrometer, comprising:an ion source; an ion trap for accumulating ions generated by said ion source, said ion trap having a ring electrode and a pair of endcap electrodes each having an aperture; a light irradiation device for irradiating said ions with a light, said ions being accumulated within said ion trap; an ion detection device for detecting said ions ejected from said ion trap; and a device for controlling an application timing period of an alternating-current voltage between said endcap electrodes and an irradiation timing period of said light, wherein said light passes through apertures of said endcap electrodes so as to introduce said light into said ion trap along a central axis of said ion trap, and wherein the application timing period of said alternating-current voltage and the irradiation timing period of said light overlap with each other at least partially.