Multipole rod assembly for spectrometers and ion...

Details Multipole rod assembly for spectrometers and ion... Multipole rod assembly for spectrometers and ion...

H - Electricity

01

J

H01J 49/02 (2006.01) H01J 49/26 (2006.01)

Patent

CA 2270713

A multipole rod assembly for guiding an ion stream has a large multipole rod set having relatively large dimensions, and a small multipole rod set having smaller dimensions. One end of the small multipole rod set extends within the large multipole rod set and the other end of the small multipole rod set is located outside of the large multipole rod set, so that fringing effects of fields at the ends of the large and small multipole rod sets are reduced. A second small multipole rod set can be provided axially aligned with the first small multipole rod set, and a second large multipole rod can also be provided with the second small multipole rod set extending within the second large multipole rod set. Where there is a transition between two different fields in adjacent rod sets, the invention enables the volume of the transition zone to be reduced, so as to reduce the likelihood that ions will be lost.

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