Ion transmission interface device

Abstract

The invention discloses an ion transmission interface device, and the device comprises a shell, a separation cone, an ion channel, a conductive plate and an insulating plate; the shell is used for providing a vacuum cavity environment for transmission of charged ions; the separation cone is used for guiding charged ions to enter the ion channel; the conductive plate is mounted on the insulating plate; the ion transmission hole of the conductive plate and the ion transmission hole of the insulating plate are in the same horizontal line, and the direction of the separation cone faces the ion transmission hole; the potential difference between the conductive plate and the separation cone is gradually decreased in the direction from the conductive plate to the separation cone, and charged ionssequentially penetrate through the conductive plate, the insulating plate and the separation cone through the ion transmission hole according to the gradient of the potential difference and enter theion channel. The technical problem to be solved by the invention is to improve the ion transmission efficiency of charged ions from an ion source to an ion channel while preventing uncharged particles and other impurities from entering an ion transmission hole, thereby improving the sensitivity of a mass spectrometer.

Description

Technical field [0001] The invention relates to the technical field of mass spectrometry equipment, in particular to an ion transmission interface device. Background technique [0002] The atmospheric pressure ion source used in the existing triple quadrupole mass spectrometer is generally an electrospray ion source ESI and an atmospheric pressure chemical ion source APCI. The ion transmission loss rate of charged ions from the ion source to the interface device to the vacuum ion channel is The sensitivity of the mass spectrometer has a greater impact. [0003] In traditional ion transmission, in order to prevent uncharged particles and other impurities from entering the interface device, the ion source usually directly sends charged ions into the interface device in a vertical manner when spraying. However, the ion transmission efficiency of this method is low and will Some charged ions did not enter the interface device, resulting in a decrease in the sensitivity of the mass spe...

AI Technical Summary

Problems solved by technology

[0002] Atmospheric pressure ion sources used in existing triple quadrupole mass spectrometers are generally electrospray ion source ESI and atmospheric pressure chemical ion source APCI. The sensitivity of the mass spectrometer is greatly affected

[0003] In traditional ion transmission, in order to prevent uncharged particles and other impurities from entering the interface device, the ion source usually sends charged ions directly into the interface device in a vertical manner when spraying, but the ion transmission efficiency of this method is low, and there will be Part of the charged ions do not enter the interface device, resulting in a decrease in the sensitivity of the mass spectrometer

[0004] However, due to the low ion transmission efficiency, the ion source has to continuously eject more charged ions to send enough charged ions into the interface device, thereby prolonging the working time of the device

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