Ion transfer from multipole ion guides into multipole ion guides

Details Ion transfer from multipole ion guides into multipole ion guides Ion transfer from multipole ion guides into multipole ion guides

1997-05-15

2000-09-19

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

With sample supply means

250282, B01D 5944, H01J 4900

Patent

active

061216070

ABSTRACT:
A multipole ion guide is configured to improve the transmission efficiency of ions which traverse the length of one ion guide and enter either another multipole ion guide such as a quadrupole mass analyzer or a three dimensional ion trap. The ion transfer multipole ion guide radial dimensions are reduced such that the pole assembly and an appropriately shaped exit lens can be positioned within a portion of the internal space defined by the larger radius second multipole ion guide poles. Ions exiting the first ion guide of reduced size find themselves inside the second ion guide close to the centerline. In this manner ions can be efficiently transferred from one ion guide to another, even for those ions with low kinetic energies. In a second embodiment of the invention, the exit region of a multipole ion guide is configured such that the multipole ion guide poles can be extended into a counterbore of a three dimensional ion trap end cap electrode. With this configuration, ions (including those with low kinetic energies) can be transferred into a three dimensional ion trap with increased trapping efficiency.

REFERENCES:
patent: 4990777 (1991-02-01), Hurst et al.
patent: 5179278 (1993-01-01), Douglas
patent: 5291016 (1994-03-01), Taya
patent: 5572035 (1996-11-01), Franzen
patent: 5625186 (1997-04-01), Frankervich et al.
patent: 5663561 (1997-09-01), Franzen et al.

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