The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 1996
Filed:
Jul. 20, 1994
Jochen Franzen, Bremen, DE;
Reemt-Holger Gabling, Stuhr, DE;
Bruker-Franzen Analytik GmbH, Bremen, DE;
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.