Method of selective ion trapping for quadrupole ion trap mass sp

Details Method of selective ion trapping for quadrupole ion trap mass sp Method of selective ion trapping for quadrupole ion trap mass sp

1994-01-11

1995-10-10

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Methods

250292, B01D 5944, H01J 4900

Patent

active

054573157

ABSTRACT:
A power efficient selective mass range trap filling process in which the RF trapping voltage connected to the ring electrode is slowly modulated simultaneously with: (1) e-beam ionization bombardment and (2) application of a broadband supplemental waveform containing selected secular frequencies to the QIT end caps. The modulation permits the reduction of the number of frequency components required in the broadband supplemental waveform and permits elimination of absorption by ions of energy from more than one supplemental frequency component at any one time.

REFERENCES:
patent: 4761545 (1988-08-01), Marshall et al.
patent: 5134286 (1992-07-01), Kelley
patent: 5198665 (1993-03-01), Wells
patent: 5200613 (1993-04-01), Kelley
patent: 5302826 (1994-04-01), Wells

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