Mass spectrometer

Details Mass spectrometer Mass spectrometer

2006-03-07

2010-12-28

Nguyen, Kiet T (Department: 2881)

Radiant energy

Ionic separation or analysis

With sample supply means

C250S427000, C250S42300F

Reexamination Certificate

active

07858933

ABSTRACT:
A filament3for generating thermions is remotely located from an ionization chamber2so that a thermion-accelerating electric field created by a potential difference between the filament3and the ionization chamber2is prevented from penetrating through an electron injection port5into the ionization chamber2. This design eliminates the disturbance of an ion-extracting electric field created within the ionization chamber2by a voltage applied to lens electrodes13, thus enabling ions produced within the ionization chamber2to be efficiently extracted and transported to a mass analyzer located at the subsequent stage. As a result, the level of detection signals of a detector is increased, so that the mass analysis can be performed with high sensitivity.

REFERENCES:
patent: 3555272 (1971-01-01), Munson
patent: 3602752 (1971-08-01), Shriner
patent: 7291845 (2007-11-01), Moeller et al.
patent: 09-190799 (1997-07-01), None
patent: 10-302660 (1998-11-01), None
patent: 2002-373616 (2002-12-01), None
patent: 2003-257360 (2003-09-01), None
patent: 2005-259482 (2005-09-01), None

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