Tandem high field asymmetric waveform ion mobility spectrometry (FAIMS)tandem mass spectrometry
First Claim
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1. A tandem mass spectrometer comprising a first mass analyzer within a low pressure region, a collision cell and a second mass analyzer within the low pressure region, characterized in that between the collision cell and the second mass analyzer is disposed a FAIMS analyzer.
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Abstract
A tandem mass spectrometer is disclosed. A first mass analyzer within a low-pressure region is provided for passing ions therethrough. A collision cell is at an ion outlet of the mass analyzer to provide a location for ions to collide therein with a collision gas to form resultant ions. The resultant ions are then provided to a FAIMS analyzer for separation thereof and the separate resultant ions are provided to a mass analyzer for analysis.
112 Citations
30 Claims
- 1. A tandem mass spectrometer comprising a first mass analyzer within a low pressure region, a collision cell and a second mass analyzer within the low pressure region, characterized in that between the collision cell and the second mass analyzer is disposed a FAIMS analyzer.
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13. A tandem mass spectrometer comprising a first mass analyzer within a low pressure region;
- a FAIMS for providing a collision cell and ion separation; and
a second mass analyzer within a low pressure region. - View Dependent Claims (14, 15, 16, 17, 18)
- a FAIMS for providing a collision cell and ion separation; and
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19. An apparatus for separating ions comprising:
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a) a FAIMS analyzer region defined by a space between first and second spaced apart electrodes;
b) a collision region in operational communication with the FAIMS analyzer region for providing ions to the FAIMS analyzer region, the collision region defined by a space between two electrodes, the collision region having a first gas inlet, the first gas inlet for providing a flow of a collision gas within the collision region;
c) an ion source for providing ions to the collision region; and
,d) a voltage source for providing at least a voltage to at least one of the first and second electrodes of the FAIMS analyzer region, to form an electric field therebetween, the electric field for effecting a separation of the provided ions having an approximately same mass-to-charge ratio, wherein the ions provided to the collision region interact with the collision gas to produce collisionally induced fragment ions, and wherein the ions provided to the FAIMS analyzer region include the collisionally induced fragment ions.
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20. A method for separating ions comprising:
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providing ions to a first mass analyzer for transmission therethrough to a collision region having a collision gas therein;
colliding the ions with the collision gas to produce a plurality of resultant ions;
transporting the resultant ions through an electric field resulting from application of an asymmetric waveform to an electrode to perform a separation thereof; and
,providing some of the separated ions to a second mass analyzer for analysis. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
i) providing a first asymmetric waveform and a first direct-current compensation voltage, to at least one electrode, to form an electric field therebetween, the first asymmetric waveform for effecting a difference in net displacement between two different ions in the time of one cycle of the applied first asymmetric waveform; and
,ii) setting the first compensation voltage for effecting a separation of the fragment ions having an approximately same mass-to-charge ratio, to support selective transmission of the ions within the first analyzer region.
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23. A method according to claim 20, including detecting the selectively transmitted ions by mass spectrometry.
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24. A method according to claim 23, wherein the collisions and the electric field are disposed within at least a high-pressure region.
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25. A method according to claim 24, wherein the at least a high-pressure region is disposed within a chamber within a low-pressure region.
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26. A method according to claim 25, wherein the low pressure region is a low-pressure region of a vacuum chamber.
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27. A method according to claim 22, wherein the electrodes are shaped for focusing the ions in a predetermined fashion.
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28. A method according to claim 27, wherein the electrodes are selected from the group including:
- flat parallel plates;
curved plates;
cylinders; and
, parallel rods.
- flat parallel plates;
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29. A method according to claim 28, wherein the voltage applied to the electrode has an amplitude varying in a sinusoidal fashion over time for operating the first analyzer region in an RF-only mode in which ions are other than separated by FAIMS.
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30. The method according to claim 28, wherein the electric field is provided between at least two pairs of electrodes and wherein the voltage applied to the electrode has an amplitude varying in a sinusoidal fashion over time and a dc voltage.
Specification