Focusing ions using gas dynamics

Details Focusing ions using gas dynamics Focusing ions using gas dynamics

2005-03-29

2005-03-29

Lee, John R. (Department: 2881)

Radiant energy

Ionic separation or analysis

With sample supply means

C250S282000, C250S292000

Reexamination Certificate

active

06872940

ABSTRACT:
Ion transfer assemblies and methods for directing ions from an ionization source to a mass analyzer. A first partition element separates a viscous flow region from a transition flow region. A second partition element separates the transition flow region into a first transition flow chamber and a second transition flow chamber. A focusing element defines a cavity shaped to direct a portion of a gas flow including ions entrained in a background gas from a first aperture in the first partition element towards a second aperture in the second partition element based on gas dynamics. The cavity is shaped to direct the gas flow without requiring the application of external electrostatic fields. Vents or slits can be provided in or between the first partition element and the focusing element to provide for expansion of the gas flow in the transition flow region.

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patent: 6060705 (2000-05-01), Whitehouse et al.
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