Radiant energy – Ionic separation or analysis – Methods
Patent
1994-07-20
1996-05-28
Berman, Jack I.
Radiant energy
Ionic separation or analysis
Methods
250292, H01J 4942
Patent
active
055213790
ABSTRACT:
A method is disclosed for chemical ionization of the molecules of an analysis gas or analysis gas mixture or for studying ion-molecule reactions in ion traps. Specifically, by superposing a quadrupole field with a dipolar introduced frequency mixture in which there are accurately selected frequency gaps in the ionization phase of the analysis, the only ions which are stored are those which are on the selected reaction path of the reactant gas ions for making the proper reactant ions for the desired ion-molecule reaction. All the other ions are eliminated from storage by excitation of their secular oscillations. In a second phase, by switching off the dipolar introduced frequency mixture, all the ions can be stored in a wide range of mass-to-charge ratios, and therefore also the product ions of the desired ion-molecule reactions of the analysis gas. In a third phase the spectrum of the product ions is scanned.
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Franzen Jochen
Gabling Reemt-Holger
Berman Jack I.
Bruker-Franzen Analytik GmbH
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