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US 2014/0151546 A1Published application
Multi-capillary column and high-capacity ionization interface for gc-ms
AssigneeAgilent Technologies, Inc.
InventorsGangqiang Li, Maozi Liu
Life of this patent
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Abstract
A gas chromatograph-mass spectrometer (GC-MS) system includes a multi-capillary GC column coupled to a mass analyzer through an ionization interface. The ionization interface includes an ionization device and an ion guide configured for receiving a high-capacity gas-sample flow from the GC column and transmitting a compressed ion beam to the mass analyzer. The ion beam may be converging.
Claims20
A gas chromatograph-mass spectrometer (GC-MS) system, comprising:
- a column comprising a column outlet and a plurality of capillaries arranged for establishing respective, simultaneous gas flows to the column outlet;
- an ionization interface communicating with the column outlet and comprising an ionization device and an ion guide, the ion guide comprising a guide entrance, a guide exit and a plurality of guide electrodes arranged around a guide axis and between the guide entrance and the guide exit, wherein the guide electrodes are configured for constraining ions to an ion beam that radially converges toward the guide exit;
- and
- a mass analyzer communicating with the guide exit.
1 more element
A method for acquiring a mass spectrum from a sample gas, the method comprising:
- flowing the sample gas simultaneously through a plurality of capillaries of a gas chromatograph and into an ionization interface;
- ionizing the sample gas in the ionization interface to produce ions;
- transmitting the ions through an ion guide and into a mass analyzer;
- while transmitting the ions, confining the ions to an ion beam that radially converges along an axial length of the ion guide;
- and
- while ionizing and transmitting the ions, maintaining the ionization interface at an intermediate pressure between a pressure in the gas chromatograph and a pressure in the mass analyzer.
3 more elements
Dependencies are inferred from the claim text.