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US 2003/0213899 A9Published application
Parallel plate geometry faims apparatus and method
AssigneeNational Research Council of Canada
InventorsRoger Guevremont, Randy Purves
Life of this patent
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Abstract
A method and an apparatus is disclosed for selectively transmitting ions in which the ions are subjected to a focusing effect such that the overall efficiency of ion transmission is increased. The method relies on a FAIMS analyzer having at least an electrode disposed approximately between two other electrode surfaces for producing an electric field that is symmetric on opposing sides of the at least an electrode. An ion exiting from between the electrodes experiences a balanced electric field, such that impact with one of the electrodes is prevented.
Claims48
An apparatus for separating ions, comprising a high field asymmetric waveform ion mobility spectrometer, including:
- a) an analyzer region comprising:
- a first electrode, a second electrode and a third electrode in a spaced apart stacked arrangement for allowing ion flow therebetween, the first electrode having a first inner surface, the second electrode having a first and a second surface on opposite sides thereof, the third electrode having a second inner surface;
- and,
- at least a contact on at least one of the first, second and third electrodes, for receiving a compensation voltage potential between the second and first electrodes and between the second and third electrodes, and for applying an asymmetric waveform to at least one of the electrodes,
- wherein, in use, ions exiting from between the electrodes are other than attracted to the second electrode to collide therewith.
2 more elements
An apparatus for separating ions, comprising a high field asymmetric waveform ion mobility spectrometer, including:
- a) an analyzer region comprising:
- a first electrode, a second electrode and a third electrode in a spaced apart stacked arrangement for allowing ion flow therebetween, the first electrode having a first inner surface, the second electrode having a continuous smoothly curved surface, the third electrode having a second inner surface;
- and,
- at least a contact on at least one of the first, second and third electrodes, for receiving a compensation voltage potential between the second and first electrodes and between the second and third electrodes, and for applying an asymmetric waveform to at least one of the electrodes.
1 more element
An apparatus for separating ions, comprising a high field asymmetric waveform ion mobility spectrometer, including:
- a) an analyzer region comprising:
- a first electrode having a first surface and a second surface on opposite sides thereof;
- a second electrode absent a cross section thereof forming a closed surface about a non contiguous centre region, the second electrode shaped such that a first region of the surface defines a first inner surface of the second electrode that opposes the first surface of the first electrode and a second other region of the surface defines a second inner surface of the second electrode that opposes the second surface of the first electrode;
- and,
- at least a contact on at least one of the first and second electrodes, for applying a compensation voltage potential between the second and first electrodes, and for receiving an asymmetric waveform to at least one of the electrodes,
- wherein, in use, ions exiting from between the electrodes are other than attracted to the first electrode, such that the ions other than collide therewith.
3 more elements
An analyzer comprising:
- a first electrode having in cross section an approximately continuous periphery;
- a second electrode having in cross section an approximately continuous periphery approximately equidistant from the first electrode over a region thereof and having at least an inlet for introduction of ions and a carrier gas and at least an outlet in the approximately continuous periphery;
- and,
- a contact on at least one of the first and second electrode for providing an asymmetric electric field between the first and second electrode;
- wherein, in use, ions flow through the at least an inlet about the approximately continuous periphery of the first electrode and out the at least an outlet wherein a similar electric field is present on opposing sides of the first electrode at an end proximate the at least an outlet.
2 more elements
A method for separating ions comprising the steps of:
- a) providing at least an ionization source for producing ions including two ionic species;
- b) providing an analyzer region defined by a first analyzer region between a first electrode surface on a first electrode and an opposing second electrode surface on a second electrode;
- c) providing an asymmetric waveform and a direct-current compensation voltage, to at least one of said electrode surfaces, to form an electric field between the opposing pair of electrode surfaces;
- d) setting said asymmetric waveform in order to effect a difference in net displacement between said two ionic species in the time of one cycle of said applied asymmetric waveform;
- and,
- e) setting said compensation voltage to a determined value to support selective transmission of one of said two ionic species within the analyzer region;
- f) providing ions form the ionisation source into the analyzer region;
- g) conducting the ions through the analyzer region toward an outlet therefrom;
- and,
- h) providing an electric field on an side of the first electrode opposing the first surface wherein ions exiting from the outlet from the analyzer region are other than attracted to the first electrode, such that the ions other than collide therewith.
7 more elements
A method for separating ions comprising the steps of:
- a) providing at least an ionization source for producing ions including two ionic species;
- b) providing two analyzer regions on opposing sides of an electrode, said two analyzer regions being in communication with a gas inlet, a gas outlet and an ion inlet, said ions produced by said ionization source being introduced into said two analyzer regions at said ion inlet;
- c) forming an electric field on opposing sides of the electrode by providing an asymmetric waveform and a direct-current compensation voltage to the electrode;
- d) setting said asymmetric waveform in order to effect a difference in net displacement between said two ionic species in the time of one cycle of said applied asymmetric waveform;
- and,
- e) setting said compensation voltage to a determined value to selectively focus one of said two ionic species.
3 more elements
Dependencies are inferred from the claim text.