Radiant energy – Ionic separation or analysis – Methods
Patent
1992-03-12
1993-01-26
Berman, Jack I.
Radiant energy
Ionic separation or analysis
Methods
250290, 250292, 250283, H01J 4942
Patent
active
051824515
ABSTRACT:
A method of mass analyzing a sample including the steps of defining a trap volume with a three-dimensional quadrupole field for trapping ions within a predetermined range of mass-to-charge ratio, forming or injecting ions within the trap volume such that those within the predetermined mass-to-charge ratio range are trapped within the trap volume, applying a supplementary AC field superimposed on the three-dimensional quadrupole field to form combined fields, scanning the combined fields to eject ions of consecutive mass-to-charge ratio from the trap volume for detection characterized in that the supplementary field has an amplitude just sufficient to eject the ions and that the supplementary field has a beta value below 0.891 and that the combined fields are scanned at a rate so that a length of time corresponding to 200 cycles or more of the supplementary AC field passes per consecutive thomson.
REFERENCES:
patent: 4540884 (1985-09-01), Stafford et al.
patent: 4686367 (1987-08-01), Louris et al.
patent: 4736101 (1988-04-01), Syka et al.
patent: 4749860 (1988-06-01), Kelley et al.
patent: 4771172 (1988-09-01), Weber-Grabau
Louris John N.
Schwartz Jae C.
Syka John E. P.
Berman Jack I.
Beyer Jim
Finnigan Corporation
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