Thinh Q Ha

US Patent:

8481929, Jul 9, 2013

Filed:

Feb 28, 2012

Appl. No.:

13/406767

Inventors:

Urs Steiner - Branford CT, US
Felician Muntean - Danville CA, US
Roy P Moeller - San Leandro CA, US
Thinh M Ha - San Jose CA, US

Assignee:

Bruker Daltonics, Inc. - Billerica MA

International Classification:

H01J 49/06
G01N 27/00
H01J 49/00
G01N 27/62

US Classification:

250292, 250281, 250282, 250284, 250286, 250288, 250290, 250291, 250294

Abstract:

An ion collision cell is fabricated by four semi-circular profile elements, all of which are attach to the same reference plate. Consequently, all four elements remain aligned to the same reference plate. The four elements form a semi-circular channel with a semi-circular quad electrodes. The quad electrodes receive electrical potential to form the field required to focus and maintain the ions at the center of the channel. semi-circular insulators are provided on all sides of the channel so as to seal the channel over its length from the interior of the mass spectrometer.