Mass spectrometer and mass analysis method

Details Mass spectrometer and mass analysis method Mass spectrometer and mass analysis method

2008-01-15

2008-01-15

Kim, Robert (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S282000, C250S288000, C250S281000, C095S027000, C095S028000, C096S001000, C096S002000, C096S003000, C096S015000, C096S049000, C096S054000, C096S071000

Reexamination Certificate

active

07319222

ABSTRACT:
A linear trap which allows for charge separation and ion mobility separation in a speedy manner, and enables measurement with high duty cycle. A mass spectrometer comprises an ion source, an ion trap for trapping ions ionized by the ion source, an ion trap controller for controlling a voltage on an electrode included in the ion trap, and a detector for detecting the ions ejected from the ion trap. The ion trap controller includes a table for each mass-to-charge ratio, the table containing a frequency of the voltage used for charge separation, and a gain of the voltage for ejecting a first ion with a first charge outside the ion trap, and retaining in the ion trap a second group of ions with a second charge that is lower than that of the first charge. The ion trap controller controls the voltage based on the mass-to-charge ratio set. The mass spectrometer has significantly improved sensitivity, as compared to the prior art.

REFERENCES:
patent: 5420425 (1995-05-01), Bier et al.
patent: 5783824 (1998-07-01), Baba et al.
patent: 5905258 (1999-05-01), Clemmer et al.
patent: 6177668 (2001-01-01), Hager
patent: 2002/0175279 (2002-11-01), Hager

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