Gas delivery system for mass spectrometer reaction and collision cells
First Claim
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1. A gas delivery system for a cell-based mass spectrometer, the gas delivery system comprising:
- a) a mass flow controller having an input coupled to a gas source;
b) a three-way valve having an input coupled to an output of the mass flow controller, a first output coupled to a vacuum system, and a second output; and
c) a cell positioned inside a vacuum chamber of a mass spectrometer, the second output of the three-way valve being coupled to an inlet of the cell, the mass flow controller providing a gas to the cell that increases a pressure inside the cell relative to the pressure in the vacuum chamber.
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Abstract
A gas delivery system for a cell-based mass spectrometer includes a mass flow controller having an input coupled to a gas source. A three-way valve includes an input coupled to an output of the mass flow controller, a first output coupled to a vacuum system, and a second output normally coupled to a reaction or collision cell. A cell is positioned inside a vacuum chamber of the mass spectrometer where the second output of the three-way valve is coupled to an inlet of the cell and the mass flow controller provides a gas to the cell that increases a pressure inside the cell relative to the pressure in the vacuum chamber.
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Citations
23 Claims
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1. A gas delivery system for a cell-based mass spectrometer, the gas delivery system comprising:
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a) a mass flow controller having an input coupled to a gas source; b) a three-way valve having an input coupled to an output of the mass flow controller, a first output coupled to a vacuum system, and a second output; and c) a cell positioned inside a vacuum chamber of a mass spectrometer, the second output of the three-way valve being coupled to an inlet of the cell, the mass flow controller providing a gas to the cell that increases a pressure inside the cell relative to the pressure in the vacuum chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A gas delivery system for a cell-based mass spectrometer, the gas delivery system comprising:
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a) a plurality of mass flow controllers, each of the plurality of mass flow controllers having an input coupled to an output of a respective one of a plurality of gas sources; b) a plurality of three-way valves, each of the plurality of three-way valves having an input that is coupled to an output of a respective one of the plurality of mass flow controllers, a first output of each of the plurality of three-way valves being coupled to a vacuum system; and c) a cell positioned inside a vacuum chamber of a mass spectrometer, a second output of each of the plurality of three-way valves being coupled to an inlet of the cell, at least one of the plurality of mass flow controllers providing a gas to the cell that increases a pressure inside the cell relative to the pressure in the vacuum chamber. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for delivering gas to a cell-based mass spectrometer, the method comprising:
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a) providing a gas to a mass flow controller;
b) providing a three-way valve having an input that is coupled to an output of the mass flow controller;c) evacuating the gas from the output of the mass flow controller; and d) metering the gas with the mass flow controller and directing the metered gas to a cell inside a mass spectrometer the mass flow controller providing a gas to the cell that increases a pressure inside the cell. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification