Orthogonal acceleration TOF with ion guide mode
First Claim
1. A system, comprising:
- an electronic controller; and
a time-of-flight mass analyzer in communication with the electronic controller, the time-of-flight mass analyzer comprising;
a pulsing region defining a channel that extends along an axis, the pulsing region comprising;
a first electrode extending along the axis, the first electrode defining one or more apertures;
a second electrode extending along the axis, the first and second electrodes being positioned on opposing sides of the axis in a first direction perpendicular to the axis;
a third electrode extending along the axis; and
a fourth electrode extending along the axis, the third and fourth electrodes being positioned on opposing sides of a plane defined by the axis and the first direction,wherein;
the electronic controller is programmed to apply a first set of voltages to the electrodes to constrain a motion of ions propagating along the axis in a radial direction relative to the axis, and apply a second set of voltages to the electrodes to accelerate the ions out of the pulsing region through the one or more apertures, where the first set of voltages comprises RF voltages applied to the first and second electrodes, the RF voltages being in phase with each other.
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Accused Products
Abstract
Mass spectrometry systems include an electronic controller and a time-of-flight mass analyzer in communication with the electronic controller. The time-of-flight mass analyzer includes a pulsing region defining a channel that extends along an axis. The pulsing region includes: a first electrode extending along the axis, the first electrode defining one or more apertures; a second electrode extending along the axis, the first and second electrodes being positioned on opposing sides of the axis in a first direction perpendicular to the axis. The electronic controller is programmed to apply a first set of voltages to the electrodes to constrain a motion of ions propagating along the axis in a radial direction relative to the axis, and apply a second set of voltages to the electrodes to accelerate the ions out of the pulsing region through the one or more apertures.
8 Citations
29 Claims
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1. A system, comprising:
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an electronic controller; and a time-of-flight mass analyzer in communication with the electronic controller, the time-of-flight mass analyzer comprising; a pulsing region defining a channel that extends along an axis, the pulsing region comprising; a first electrode extending along the axis, the first electrode defining one or more apertures; a second electrode extending along the axis, the first and second electrodes being positioned on opposing sides of the axis in a first direction perpendicular to the axis; a third electrode extending along the axis; and a fourth electrode extending along the axis, the third and fourth electrodes being positioned on opposing sides of a plane defined by the axis and the first direction, wherein; the electronic controller is programmed to apply a first set of voltages to the electrodes to constrain a motion of ions propagating along the axis in a radial direction relative to the axis, and apply a second set of voltages to the electrodes to accelerate the ions out of the pulsing region through the one or more apertures, where the first set of voltages comprises RF voltages applied to the first and second electrodes, the RF voltages being in phase with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
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directing ions into a channel extending along an axis in a pulsing region of a time-of-flight mass analyzer; applying RF voltages to electrodes extending along the axis to constrain a motion of the ions in a radial direction relative to the axis; and applying DC voltages to the electrodes to accelerate the ions out of the pulsing region in a direction orthogonal to the axis, wherein applying the RF voltages comprises applying in-phase voltages to a first pair of electrodes positioned on opposing sides of the axis in a first direction perpendicular to the axis, the first pair of electrodes comprising an electrode that defines one or more apertures through which the ions exit the pulsing region. - View Dependent Claims (11, 12, 13, 14)
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15. A mass spectrometry system, comprising:
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an ion source; a time-of-flight analyzer assembly comprising a pulsing region, a flight tube and a detector; an ion transport assembly arranged to receive ions from the ion source and direct the ions to the pulsing region of the time-of-flight analyzer assembly; and an electronic controller in communication with the time-of-flight analyzer assembly, wherein; the pulsing region defines a channel that extends along an axis and the pulsing region comprises a first electrode extending along the axis, the first electrode defining one or more apertures, a second electrode extending along the axis, the first and second electrodes being positioned on opposing sides of the axis in a first direction perpendicular to the axis; a third electrode extending along the axis; and a fourth electrode extending along the axis, the third and fourth electrodes being positioned on opposing sides of a plane defined by the axis and the first direction during operation the electronic controller causes the pulsing region to operate sequentially in a first mode, in which ions in an ion beam are confined to trajectories along an axis of the pulsing region, and a second mode, in which the ions are accelerated in a direction orthogonal to the axis into the flight tube, where the first mode comprises applying a first set of voltages to the electrodes, the first set of voltages comprising applying to the first and second electrodes RF voltages that are in phase with each other, and the second mode comprises applying a second set of voltages to the electrodes. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for analyzing ions using a time-of-flight mass analyzer, the method comprising:
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ionizing a sample to generate ions; directing the ions to a pulsing region of a time-of-flight mass analyzer; providing a first electric field within the pulsing region to guide the ions along an axis within the pulsing region; providing a second electric field within the pulsing region to accelerate the ions perpendicular to the axis and out of the pulsing region; detecting the accelerated ions at a detector; and analyzing a mass of the ions based on a time-of-flight from the pulsing region to the detector, wherein providing the first electric field comprises applying a first RF voltage waveform to a first pair of the electrodes, the first pair of electrodes comprising an electrode that defines one or more apertures through which the ions exit the pulsing region. - View Dependent Claims (26, 27, 28, 29)
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Specification