Method of clean removal of ions

Details Method of clean removal of ions Method of clean removal of ions

1992-11-25

1994-07-19

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Methods

250292, B01D 5944, H01J 4900

Patent

active

053311574

ABSTRACT:
A method of clean removal of ions from an ion trap mass spectrometer removes ions having a mass greater than a desired ion mass m using non-linear resonance. The ion trap mass spectrometer includes two end cap electrodes and an annular electrode. A high-frequency quadrupolar field with at least one superposed weak multipolar field is generated in the ion trap mass spectrometer. Higher mass ions are eliminated with minimal loss of ions having the desired mass m by adjusting the amplitude of a storage HF so that one of the physically determined non-linear resonance conditions of the multipolar field is satisfied for ions of mass m+1. The ions are weakly oscillated by applying an HF excitation voltage to the end caps of the ion trap mass spectrometer, such that ions of mass m+1 receive energy through non-linear resonance from the storage HF and leave an ion trap of the ion trap mass spectrometer. Ions having the desired mass m remain inside an ion cage.

REFERENCES:
patent: 4749860 (1988-06-01), Kelley et al.
patent: 4761545 (1988-08-01), Marshall et al.
patent: 4818869 (1989-04-01), Weber-Graban
patent: 4882484 (1989-11-01), Franzen et al.
patent: 5075547 (1991-12-01), Johnson et al.
patent: 5170054 (1992-12-01), Franzen

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