Electronic time-of-flight mass selector

Details Electronic time-of-flight mass selector Electronic time-of-flight mass selector

2005-06-22

2010-11-09

Berman, Jack I (Department: 2881)

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

C250S281000, C250S282000, C250S288000

Reexamination Certificate

active

07829843

ABSTRACT:
A method of selecting ions includes generating a group of ions, accelerating the group of ions through a flight region towards an electronic mass selector grid, and selectively varying a voltage applied to the electronic mass selector grid, such that only a selected subset of the group of ions passes through the grid. An apparatus for selecting ions includes an ion generator, an ion accelerator for accelerating ions into a flight region, and an electronic mass selector grid responsive to an applied voltage to pass a subset of the ions from the flight region. An apparatus for detecting a threat molecule includes an ion generator for generating ions from a mixed gas stream, an ion accelerator for accelerating the ions into a flight region, and an electronic mass selector grid. The grid passes only a subset of the ions, such as ions and/or ionized fragments of the threat molecule.

REFERENCES:
patent: 4694167 (1987-09-01), Payne et al.
patent: 5654543 (1997-08-01), Li
patent: 2003/0020014 (2003-01-01), Zimmermann et al.
PCT/US2005/022199, Written Opinion, Sep. 21, 2005, 5 pages.

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