Ion storage device with direction-selective radial ejection
First Claim
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1. An ion storage device, comprising:
- at least four elongated electrodes defining an ion storage volume, the electrodes defining first and second radial directions along with ions may be ejected from the ion storage volume to a location external to the ion storage device, the first and second radial directions being different;
a power supply for providing RF potentials to the at least four electrodes to establish an RF field that radially confines ions within the ion storage volume;
the power supply further providing independently controllable DC offsets to each one of the at least four electrodes, the power supply being configured to, in response to selection of one of the first or second radial directions, adjust DC offsets applied to the at least four electrodes to cause ions to be orthogonally ejected from the ion volume in the selected radial direction.
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Abstract
The present invention provides a radio frequency (RF) power supply in a mass spectrometer. The power supply provides an RF signal to electrodes of a storage device to create a trapping field. The RF field is usually collapsed prior to ion ejection. In an illustrative embodiment the RF power supply includes a RF signal supply; a coil arranged to receive the signal provided by the RF signal supply and to provide an output RF signal for supply to electrodes of an ion storage device; and a shunt including a switch operative to switch between a first open position and a second closed position in which the shunt shorts the coil output.
17 Citations
12 Claims
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1. An ion storage device, comprising:
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at least four elongated electrodes defining an ion storage volume, the electrodes defining first and second radial directions along with ions may be ejected from the ion storage volume to a location external to the ion storage device, the first and second radial directions being different; a power supply for providing RF potentials to the at least four electrodes to establish an RF field that radially confines ions within the ion storage volume; the power supply further providing independently controllable DC offsets to each one of the at least four electrodes, the power supply being configured to, in response to selection of one of the first or second radial directions, adjust DC offsets applied to the at least four electrodes to cause ions to be orthogonally ejected from the ion volume in the selected radial direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A mass spectrometer, comprising:
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an ion storage device including at least four elongated electrodes defining an ion storage volume; a first mass analyzer positioned to receive ions orthogonally ejected from the ion storage device in a first radial direction; a processing device including at least one of a collision/reaction cell and a second mass analyzer positioned to receive ions orthogonally ejected from the ion storage device in a second radial direction, the second radial direction being different from the first radial direction; a power supply for providing RF potentials to the at least four electrodes to establish an RF field that radially confines ions within the ion storage volume; the power supply further providing independently controllable DC offsets to each one of the at least four electrodes, the power supply being configured to, in response to selection of one of the first or second radial directions, adjust DC offsets applied to the at least four electrodes to cause ions to be orthogonally ejected from the ion volume in the selected radial direction. - View Dependent Claims (11, 12)
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Specification