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US 2003/0150985 A1Published application
Faims apparatus and method with ion diverting device
AssigneeNational Research Council of Canada
InventorsRoger Guevremont, Randy Purves
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Abstract
A method and an apparatus for selectively transmitting ions a FAIMS analyzer is disclosed. An ion diverter is included within a FAIMS analyzer for affecting the trajectories of ions after separation to direct the ions in a known fashion. The ion diverter is optically a gas flow source or an electrode for generating an electrical field to alter ion flow.
Claims35
An apparatus for separating ions, comprising:
- a high field asymmetric waveform ion mobility spectrometer including:
- two electrodes at least one of which is for receiving an asymmetric waveform electrical signal and for producing a field between the electrodes;
- an ion inlet;
- an analyzer region in communication with the ion inlet and defined by at least
- a first ion flow path between the two electrodes;
- and,
- an ion diverter separate from the two electrodes for diverting the ions from the ion flow path in a known fashion.
4 more elements
A method for separating ions comprising the steps of
- a) providing an asymmetric waveform and a direct-current compensation voltage to an electrode to form an analyzer electric field, the field for effecting a difference in net displacement between ions in a time of one cycle of the applied asymmetric waveform for effecting a first separation of the ions by forming a subset thereof;
- b) producing ions within an ionization source;
- c) transporting said produced ions through the electric field along at least a first ion flow path in a direction approximately transverse to the electric field;
- and,
- d) diverting the selectively transmitted ions relative to the ion flow path as it would be absent the step of diverting in a predetermined fashion after separation.
2 more elements
Dependencies are inferred from the claim text.