The University of British Columbia

Mds Analytical Technologies, a Business Unit of Mds Inc.

Dh Technologies Development Pte. Ltd.

Nikolai Konenkov

Donald J Douglas

Frank Londry

Chuanfan Ding

Xianzhen Zhao

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.

Method of operating quadrupoles with added multipole fields to provide mass analysis in islands of stability

A mass spectrometer and a method of operating and building same is provided in which a hexapole component is deliberately added to a substantially quadrupole field. This can result in unwanted octopole and dipole fields also being added to the substantially quadrupole field. Modifications to the mass spectrometer as well as ways of operating the mass spectrometer are provided for dealing with the unwanted octopole and dipole fields.

Linear quadrupoles with added hexapole fields and method of building and operating same

Growing community of inventors

Ryazan, Russia

Nikolai Konenkov