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. 24, 2005
Filed:
Aug. 05, 2002
Mikhail Soudakov, Cheshire, GB;
Donald J. Douglas, Vancouver, CA;
Chuan-fan Ding, Vancouver, CA;
University of British Columbia, Vancouver, CA;
Abstract
A method and apparatus for manipulating ions using a two-dimensional substantially quadrupole field, and a method of manufacturing an apparatus for manipulating ions using a two-dimensional substantially quadrupole field are described. The field has a quadrupole harmonic with amplitude A, an octopole harmonic with amplitude A, and higher order harmonics with amplitudes Aand A. The amplitude Ais less than A. The Acomponent of the field is selected to improve the performance of the field with respect to ion selection and ion fragmentation. The selected Acomponent can be added by selecting a degree of asymmetry under a 90° rotation about a central axis of the quadrupole. The degree of asymmetry is selected to be sufficient to provide the selected Acomponent.