Quadrupole FAIMS apparatus
First Claim
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1. An apparatus for transmitting ions in the gas phase, the apparatus comprising:
- an electrode assembly comprising at least four electrodes defining an ion transmission channel therebetween, the ion transmission channel extending along a curved path between first and second opposite ends of the electrode assembly and being bounded between opposing pairs of the at least four electrodes; and
,an electrical controller that is selectably switchable between a first operating mode and a second operating mode during ion transmission, the electrical controller in communication with at least one of the at least four electrodes for establishing first electric field conditions within the ion transmission channel for separating ions according to the FAIMS principle when operating in the first operating mode and for establishing second electric field conditions within the ion transmission channel for transmitting ions using the principle of an rf-only ion guide device when operating in the second operating mode.
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Abstract
A combined rf-only/FAIMS apparatus is disclosed for use in mass spectrometry and other applications. The disclosed apparatus includes a plurality of curved electrodes arranged around a central ion transmission channel. FAIMS functionality is removed electronically when not desired by application of radio frequency (rf) waveforms to the curved electrodes.
23 Citations
24 Claims
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1. An apparatus for transmitting ions in the gas phase, the apparatus comprising:
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an electrode assembly comprising at least four electrodes defining an ion transmission channel therebetween, the ion transmission channel extending along a curved path between first and second opposite ends of the electrode assembly and being bounded between opposing pairs of the at least four electrodes; and
,an electrical controller that is selectably switchable between a first operating mode and a second operating mode during ion transmission, the electrical controller in communication with at least one of the at least four electrodes for establishing first electric field conditions within the ion transmission channel for separating ions according to the FAIMS principle when operating in the first operating mode and for establishing second electric field conditions within the ion transmission channel for transmitting ions using the principle of an rf-only ion guide device when operating in the second operating mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for transmitting ions in the gas phase, the apparatus comprising:
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a first electrode defining a first arc-shaped electrode surface and a second electrode defining a second arc-shaped electrode surface, the second arc-shaped electrode surface being spaced-apart from and facing the first arc-shaped electrode surface so as to define therebetween a generally arc-shaped ion transmission channel; a third electrode defining a third electrode surface and a fourth electrode defining a fourth electrode surface, the fourth electrode surface being spaced-apart from and facing the third electrode surface, the third electrode and the fourth electrode being disposed one each adjacent opposite edges of the generally arc-shaped ion transmission channel; and
,an electrical controller that is selectably switchable between a first operating mode and a second operating mode, the electrical controller in communication with at least one of the first, second, third and fourth electrodes for establishing first electric field conditions within the generally arc-shaped ion transmission channel for separating ions according to the FAIMS principle when operating in the first operating mode and for establishing second electric field conditions within the generally arc-shaped ion transmission channel for transmitting ions using the principle of an rf-only ion guide device when operating in the second operating mode. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus for transmitting ions in the gas phase, the apparatus comprising:
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an electrode assembly, comprising; a first electrode having a first electrode surface defining an arc segment of a circle of radius R1 and extending along an arc segment length L1; a second electrode having a second electrode surface defining an arc segment of a circle of radius R2 and extending along an arc segment length L2, wherein R1<
R2 and L1<
L2 and wherein the first electrode surface is disposed in a spaced-apart facing relationship relative to the second electrode surface so as to define a generally arc-shaped ion transmission channel therebetween; and
,two edge-electrodes disposed one each adjacent opposite sides of the generally arc-shaped ion transmission channel and spaced-apart one from the other in a direction that is normal to the direction of spacing between the first electrode and the second electrode; and
,an electrical controller that is selectably switchable between a first operating mode and a second operating mode during ion transmission, the electrical controller in communication with the electrode assembly for establishing first electric field conditions within the generally arc-shaped ion transmission channel for separating ions according to the FAIMS principle when operating in the first operating mode and for establishing second electric field conditions within the generally arc-shaped ion transmission channel for transmitting ions using the principle of an rf-only ion guide device when operating in the second operating mode. - View Dependent Claims (23, 24)
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Specification