US 2003/0155507 A1 · Mass spectrometer

Abstract

There is provided a tandem mass spectrometry that, in a quadrupole ion trap, allows small mass-number product ions to be detected without lowering the sensitivity and the resolution. In the quadrupole ion trap, ions are produced by an ion source. Next, the ions are accumulated within a 3-dimensional quadrupole electric field formed by a pair of endcap electrodes and a ring electrode. Finally, the accumulated ions are isolated and dissociated, then being detected. In this quadrupole ion trap, there are provided a mechanism for introducing a laser light, and a mechanism for generating a supplemental alternating-current electric field at the time of the ion dissociation. Moreover, the direction of the supplemental alternating-current electric field and the introduction direction of the laser light are made identical to each other.

Claims15

Dependent claims

A mass spectrometer, comprising:

an ion source,
an ion trap for accumulating ions generated by said ion source,
a light irradiation device for irradiating said ions with a light, said ions being accumulated within said ion trap, and
an ion detection device for detecting said ions ejected from said ion trap, wherein said ion trap includes an endcap electrode and a ring electrode (8), a direction of an electric field vector being identical to a direction of said light irradiation, said electric field vector being generated by an alternating-current voltage applied to said endcap electrode.

1 more element

Dependencies are inferred from the claim text.

Mass spectrometer

Life of this patent

Mass spectrometer

Life of this patent

Abstract

Claims15