Pulsers for time-of-flight mass spectrometers with...

Details Pulsers for time-of-flight mass spectrometers with... Pulsers for time-of-flight mass spectrometers with...

2005-06-07

2005-06-07

Lee, John R. (Department: 2881)

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

C250S281000, C250S295000

Reexamination Certificate

active

06903332

ABSTRACT:
The invention relates to the construction and operation of a slit diaphragm pulser for a time-of-flight mass spectrometer with orthogonal injection of the ions to be examined. The invention includes switching three diaphragm potentials during a transition from a filling phase to an acceleration phase in order to maintain a potential along the axis of the injected ion beam at a constant level, to prevent any penetration by the accelerating fields during the filling phase and to obtain extremely high mass resolution in the acceleration phase through a lens effect.

REFERENCES:
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patent: 5777325 (1998-07-01), Weinberger et al.
patent: 5886345 (1999-03-01), Koster et al.
patent: 5905259 (1999-05-01), Franzen
patent: 5969348 (1999-10-01), Franzen
patent: 6518568 (2003-02-01), Kovtoun et al.
patent: 2001/0011703 (2001-08-01), Franzen
patent: 2 361 353 (2001-10-01), None
patent: WO 97/48120 (1997-12-01), None
patent: WO 98/00224 (1998-01-01), None
patent: WO 01/11660 (2001-02-01), None
patent: WO 01/11660 (2001-02-01), None
patent: WO 01/27971 (2001-04-01), None
Wiley, W.C. et al., “Time-of-Flight Mass Spectrometer with Improved Resolution”, The Review of Scientific Instruments, vol. 26, No. 12, Dec., 1955, pp. 1150-1157.

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