The University of British Columbia

Fudan University

Mds Inc.

Chuan-Fan Ding

Donald J Douglas

Frank Londry

Mikhail Soudakov

Mikhail Sudakov

An ion trap mass analyzer includes an elongated tunnel that has a wall, a longitudinal axis and an inner space. The wall includes a substrate and conductor trace patterns. There is also a variable electric potential means for providing electric potentials which is connected to the conductor trace patterns. The conductor trace patterns and the variable electric potential means provide a variable electric field within the inner space of the tunnel for transferring, storing, and analyzing ions.

Ion trap mass analyzer

A method and apparatus for manipulating ions using a two-dimensional substantially quadrupole field, and a method of manufacturing and operating an apparatus for manipulating ions using a two-dimensional substantially quadrupole field are described. The field has a quadrupole harmonic with amplitude Aand a hexapole harmonic with amplitude A. The amplitude Aof the hexapole component of the field is selected to improve the performance of the field with respect to ion selection and ion fragmentation.

Method and apparatus for providing two-dimensional substantially quadrupole fields having selected hexapole components

A mass spectrometer having an elongated rod set, and a method of operating same. The rod set has an entrance end, an exit end and a longitudinal axis. Ions are admitted into the entrance end of the rod set. At least some of the ions are trapped in the rod set by producing a barrier field at an exit member adjacent to the exit end of the rod set and by producing an RF field between the rods of the rod set adjacent at least the exit end of the rod set. The RF and barrier fields interact in an extraction region adjacent to the exit end of the rod set to produce a fringing field. Ions in the extraction region are energized to mass selectively eject at least some ions of a selected mass to charge ratio axially from the rod set past the barrier field. The RF field is a two-dimensional substantially quadrupole field having a quadrupole harmonic with amplitude A, an octopole harmonic with amplitude A, and a hexadecapole harmonic with amplitude A. Ais less than A, and Ais greater than 0.1% of A.

Axial ejection with improved geometry for generating a two-dimensional substantially quadrupole field

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&#xb0; rotation about a central axis of the quadrupole. The degree of asymmetry is selected to be sufficient to provide the selected Acomponent.

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Chuan-Fan Ding