Method and instrument for mass analyzing samples with a quistor

Details Method and instrument for mass analyzing samples with a quistor Method and instrument for mass analyzing samples with a quistor

1989-12-29

1990-12-04

Berman, Jack I.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250281, 250282, 250290, H01J, H01J

Patent

active

049755773

ABSTRACT:
A method for the measurement of mass spectra by three dimensional quadrup fields (QUISTORs) is presented, in which the ions are mass-to-charge selectively ejected by a selected nonlinear resonance effect in an inharmonic QUISTOR. In order to enhance scan speed and mass resolution, the ejection of a single kind of ions can be confined to a very small time interval, either by the generation of ions within a small volume outside the field center, or by an excitation of the secular amplitudes by an additional RF voltage across the end electrodes, shortly before the ions encounter the sum resonance condition. An instrument for this method is described.

REFERENCES:
patent: 4540884 (1985-09-01), Stafford et al.
patent: 4736101 (1988-04-01), Syka et al.
patent: 4755670 (1988-07-01), Syka et al.
patent: 4818869 (1989-04-01), Weber-Grabau
patent: 4882484 (1989-11-01), Franzen et al.

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