Ion trap type mass spectrometer

Details Ion trap type mass spectrometer Ion trap type mass spectrometer

2005-01-04

2005-01-04

Lee, John R. (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S291000, C250S281000, C250S282000

Reexamination Certificate

active

06838665

ABSTRACT:
A method of discriminating singly-charged ions from multiply-charged ions using an inexpensive ion trap type mass spectrometer is provided. A mass-analyzing method using an ion trap type mass spectrometer equipped with a ring electrode and one pair of end cap electrodes temporarily traps ions in a three-dimensional quadropole field to mass-analyze a sample. The method comprises applying a main high frequency voltage to the ring electrode forming a three-dimensional quadropole field; generating ions in the mass analyzing unit or injecting ions from the outside and trapping the ions of a predetermined mass-to-charge ratio in the mass analyzing unit; applying a supplementary AC voltage having a plurality of frequency components between the end cap electrodes and scanning the frequency components of the supplementary AC voltage; and scanning a main high frequency voltage and ejecting ions from the mass analyzing unit and detecting thereof. With this, chemical noises can be reduced dramatically.

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