Time-of-flight mass spectrometer

Details Time-of-flight mass spectrometer Time-of-flight mass spectrometer

2005-06-14

2005-06-14

Lee, John R. (Department: 2881)

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

C250S281000, C250S282000, C250S286000, C250S288000, C250S291000, C250S292000, C250S294000, C250S295000, C250S296000, C250S298000, C250S299000, C250S300000

Reexamination Certificate

active

06906321

ABSTRACT:
In a TOF-MS according to the present invention, ions fly a round orbit or a reciprocal path once or more than once to be separated by their mass to charge ratios before they are detected by a detector, The detector is movable at least in two positions, where the effective distances from the exit of the round orbit or the reciprocal path to the detector are different. The length of time of flight of ions in each position of detector is measured, and the mass to charge ratio of an ion is calculated based on the difference of the lengths of time of flight in at least two positions. Similarly, the ion source may be movable at least in two positions, and a similar method can be used to calculate or estimate the mass to charge ratio of ions.

REFERENCES:
patent: 6794641 (2004-09-01), Bateman et al.
patent: 2004/0026613 (2004-02-01), Bateman et al.
patent: 2005/0017169 (2005-01-01), Yamaguchi
patent: 11-135060 (1999-05-01), None

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