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Screening time-of-flight mass spectrometer detector and ion screening method

A technology of time-of-flight mass spectrometry and ion screening, which is applied in the field of screening time-of-flight mass spectrometer detectors and ion screening, can solve problems such as inability to remove ions, and achieve the effects of reducing attenuation, prolonging service life, and improving sensitivity

Active Publication Date: 2016-05-04
GUANGZHOU HEXIN INSTR CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common method is to add quadrupole and other components in the ion transmission area, and remove the ions before they enter the TOF. However, this method can only remove all ions within a certain range by changing the RF frequency applied to the quadrupole, and cannot Remove unwanted ions outside this range

Method used

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  • Screening time-of-flight mass spectrometer detector and ion screening method
  • Screening time-of-flight mass spectrometer detector and ion screening method
  • Screening time-of-flight mass spectrometer detector and ion screening method

Examples

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Embodiment Construction

[0023] Such as figure 1 and figure 2 As shown, the detector in this embodiment includes signal line 1, anode plate 2, electrode plate 3, electrode sheet 4, microchannel plate MCP8, upper grid 5, middle grid 6, lower grid 7, removal pulse String 9.

[0024] The signal line 1 is connected to the anode plate 2, the signal line 1 is fixed on the center of the anode plate by the metal base 11, the anode plate 2 is embedded in the middle of the PEEK plate 10, and the bottom is parallel to the PEEK plate 10. Below the anode plate 2 is an electrode plate 4, and the anode plate and the electrode plate 4 are separated and insulated by four 2mm thick ceramic pads. The electrode sheet 4 is directly below the electrode sheet 3, and the upper grid 5 is directly below the electrode sheet 4. A microchannel plate MCP8 upper grid is respectively arranged between the electrode plate 3 and the electrode sheet 4, and the electrode sheet 4 and the upper grid 5. 5 is the middle grid 6, below the...

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Abstract

The invention relates to a filter type flight time mass spectrometer detector which comprises a microchannel plate (MCP) and an anode plate located on the back side of the MCP. A signal line is connected to the anode plate, the front side of the MCP is sequentially provided with a lower grid, a middle grid and an upper grid in the ion incoming direction, and the middle grid is externally connected with an electric pulse generator. The invention further relates to an ion screening method. Due to the fact that the electric pulse generator is connected with the middle grid, a removing pulse train is generated; when ions which are not needed come in, removing pulses are excited, so that the ions which are not needed are removed before reaching the MCP, a spectrogram is clean, analysis of a target peak is not influenced, and flexibility of the detector is improved; meanwhile, attenuation of the MCP is reduced, and the service life of the MCP is greatly prolonged. The filter type flight time mass spectrometer detector can be used for detection of a flight time mass spectrometer.

Description

technical field [0001] The invention relates to a time-of-flight mass spectrometer, in particular to a screening time-of-flight mass spectrometer detector and an ion screening method. Background technique [0002] The principle of time-of-flight mass spectrometer (TOF) is: in a vacuum environment, the repulsive positive and negative pulses in the repulsion zone push the ion beam into the acceleration zone so that the ions obtain acceleration energy, and different ions have different flight speeds. After the field-free flight, the ions will enter the detection area according to their mass-to-charge ratio for separation and detection. [0003] In the detection area, a microchannel plate ion detector (MCP for short) is usually selected as the standard configuration detector. Because MCP has the characteristics of fast response time, high sensitivity, high signal-to-noise ratio and large detection area, it is especially suitable as a detector for time-of-flight mass spectromete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J49/40H01J49/02
CPCH01J49/025H01J43/246
Inventor 顾超峰马理高伟黄正旭谭国斌谢春光吴曼曼周振
Owner GUANGZHOU HEXIN INSTR CO LTD
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