Apparatus for delivering ions from a grounded electrospray...

Details Apparatus for delivering ions from a grounded electrospray... Apparatus for delivering ions from a grounded electrospray...

2006-05-09

2006-05-09

Font, Frank G. (Department: 2883)

Radiant energy

Ionic separation or analysis

C250S282000, C250S287000, C250S288000, C250S292000, C250S42300F, C250S42300F, C250S424000, C250S425000

Reexamination Certificate

active

07041966

ABSTRACT:
The present invention relates to an apparatus for delivering ions to a vacuum chamber. The apparatus comprises an ionization chamber, an ionization region within the ionization chamber, a vacuum interface at a vacuum interface voltage and a vacuum chamber, wherein the ionization chamber communicates with the vacuum chamber through the vacuum interface. Sample is introduced into the ionization chamber from an electrospray assembly at approximately ground potential. Two electrodes are provided within the chamber such that three electric fields are generated, a first field extending from the electrospray assembly to the first electrode, a second field extending from the second electrode to the first electrode, and a third field extending from the second electrode to the vacuum interface. Ions are forced to travel through the fields in order before entering the vacuum chamber. In addition, the invention provides a method of delivering ions to a vacuum chamber.

REFERENCES:
patent: 5614711 (1997-03-01), Li et al.
patent: 6147345 (2000-11-01), Willoughby
patent: 6157030 (2000-12-01), Sakairi et al.
patent: 6204500 (2001-03-01), Whitehouse et al.
patent: 6455845 (2002-09-01), Li et al.
patent: 6534764 (2003-03-01), Verentchikov et al.
U.S. Appl. No. 09/579,276, filed May 2000, Frazer et al.

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