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. 04, 2010
Filed:
Feb. 07, 2007
Nikolai Konenkov, Ryazan, RU;
Donald J. Douglas, Vancouver, CA;
Xianzhen Zhao, Vancouver, CA;
The University of British Columbia, Vancouver, CA;
Abstract
A method of processing ions in a quadrupole rod set is provided, comprising a) establishing and maintaining a two-dimensional substantially quadrupole field having a quadrupole harmonic with amplitude Aand a selected higher order harmonic with amplitude Aradially confining ions having Mathieu parameters a and q within a stability region defined in terms of the Mathieu parameters a and q; c) adding an auxiliary excitation field to transform the stability region into a plurality of smaller stability islands defined in terms of the Mathieu parameters a and q; and, d) adjusting the two-dimensional substantially quadrupole field to place ions within a selected range of mass-to-charge ratios within a selected stability island in the plurality of stability islands.