MASS SPECTROMETER HAVING AN ION GUIDE WITH AN AXIAL FIELD
First Claim
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1. An ion guide comprising:
- (a) a plurality of electrodes arranged about a device centerline to form an internal volume, at least two of the electrodes including a longitudinally extending gap, in which the longitudinally extending gap splits the electrode into two portions displaced from one another, the electrodes including an inward surface facing the device centerline to form a periphery of the internal volume;
(b) a plurality of resistive inserts configured to be proximate to at least two of the gaps and radially aligned with respect to the device centerline, the resistive inserts including an innermost surface that faces the device centerline where the innermost surface is a first distance from the periphery of the internal volume;
(c) a RF voltage supply configured to apply a RF voltage to the plurality of electrodes that establishes a RF field to radially confine ions; and
(d) a DC voltage supply configured to apply a first DC voltage to a first location of the resistive insert and a second DC voltage to a second location of the resistive insert that establishes an axial electric field gradient along at least a portion of the device centerline, in which the second DC voltage is different than the first DC voltage and the second location is longitudinally spaced apart from the first location.
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Abstract
A mass spectrometer having an ion guide with an axial field is described. The ion guide includes electrodes with longitudinally extending gaps and inserts configured to be proximate to the gaps.
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Citations
28 Claims
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1. An ion guide comprising:
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(a) a plurality of electrodes arranged about a device centerline to form an internal volume, at least two of the electrodes including a longitudinally extending gap, in which the longitudinally extending gap splits the electrode into two portions displaced from one another, the electrodes including an inward surface facing the device centerline to form a periphery of the internal volume; (b) a plurality of resistive inserts configured to be proximate to at least two of the gaps and radially aligned with respect to the device centerline, the resistive inserts including an innermost surface that faces the device centerline where the innermost surface is a first distance from the periphery of the internal volume; (c) a RF voltage supply configured to apply a RF voltage to the plurality of electrodes that establishes a RF field to radially confine ions; and (d) a DC voltage supply configured to apply a first DC voltage to a first location of the resistive insert and a second DC voltage to a second location of the resistive insert that establishes an axial electric field gradient along at least a portion of the device centerline, in which the second DC voltage is different than the first DC voltage and the second location is longitudinally spaced apart from the first location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22)
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14. (canceled)
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23. (canceled)
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24. A mass spectrometer comprising:
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(a) an ionization source configured to ionize molecules; (b) an ion guide configured to receive the ionized molecules, the ion guide comprising; (i) a plurality of electrodes arranged about a device centerline to form an internal volume, at least two of the electrodes including a longitudinally extending gap, in which the longitudinally extending gap splits the electrode into two portions displaced from one another, the electrodes including an inward surface facing the device centerline to form a periphery of the internal volume; (ii) a plurality of resistive inserts configured to be proximate to at least two of the gaps and radially aligned with respect to the device centerline, the resistive inserts including an innermost surface that faces the device centerline where the innermost surface is a first distance from the periphery of the internal volume; (iii) a RF voltage supply configured to apply a RF voltage to the plurality of electrodes that establishes a RF field to radially confine ions; and (iv) a DC voltage supply configured to apply a first DC voltage to a first location of the resistive insert and a second DC voltage to a second location of the resistive insert that establishes an axial electric field gradient along at least a portion of the device centerline, in which the second DC voltage is different than the first DC voltage and the second location is longitudinally spaced apart from the first location. (c) a mass analyzer configured to receive the ionized molecules from the ion guide and filter the ionized molecules so that a subset of ionized molecules having a particular mass to charge ratio passes through; and (d) a detector configured to receive and measure the ionized molecules from the mass analyzer.
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25. An ion guide comprising:
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(a) a plurality of electrodes arranged about a device centerline to form an internal volume, the internal volume including a front end configured to allow ions to enter and a back end configured to allow ions to exit, where at least two of the electrodes including a longitudinally extending gap, in which the longitudinally extending gap splits the electrode into two portions displaced from one another, the electrodes including an inward surface facing the device centerline to form a periphery of the internal volume; (b) a plurality of conductive inserts configured to be proximate to at least two of the gaps, the conductive inserts including an innermost surface that faces the device centerline where the innermost surface includes (i) a first distance from the periphery of the internal volume at the front end, and (ii) a second distance from the periphery of the internal volume at the back end, the first distance being greater than the second distance; (c) a RF voltage supply configured to apply a RF voltage to the plurality of electrodes that establishes a RF field to radially confine ions; and (d) a DC voltage supply configured to apply a DC voltage to the conductive inserts that establishes an axial electric field gradient to move ions along the device centerline. - View Dependent Claims (26)
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27. A method of guiding ions in a mass spectrometer, the method comprising:
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(a) injecting ions into an ion guide, the ion guide comprising; (i) a plurality of electrodes arranged about a device centerline to form an internal volume, the internal volume including a front end configured to allow ions to enter and a back end configured to allow ions to exit, where at least two of the electrodes including a longitudinally extending gap, in which the longitudinally extending gap splits the electrode into two portions displaced from one another; (ii) a plurality of inserts configured to be proximate to at least two of the gaps, the inserts including an innermost surface that faces the device centerline where the innermost surface includes a first distance from the device centerline; (b) applying a RF voltage to the plurality of electrodes that establishes a RF field to radially confine ions; and (c) applying at least one DC voltage to the plurality of inserts that establishes an axial electric field gradient along at least a portion of the device centerline. - View Dependent Claims (28)
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Specification