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A Photoionization Source Device Using Charge Saturation to Enhance Ion Transport

A technology for ion transmission and transmission electrodes, applied in the field of mass spectrometry, can solve the problems of decreased sensitivity of mass spectrometry and unusable sample molecules

Active Publication Date: 2020-12-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This means that the increased ionization volume leads to a decrease in the sensitivity of the mass spectrometer
On the other hand, the volume irradiated by the light beam in the photoionization source is not large, and the sample molecules outside the light irradiation are unavailable

Method used

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  • A Photoionization Source Device Using Charge Saturation to Enhance Ion Transport

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Embodiment Construction

[0018] see figure 1 , is a structural schematic diagram of the present invention. The present invention includes a light source 1 for ionization, an ionization chamber 2, a sample injection tube 3, a transmission electrode group 4, an air pump 5, a hole electrode 6 and an insulating tube 7;

[0019] It is characterized in that: the ionization chamber 2 is a closed chamber, and coaxial through-holes are opened on the walls at the upper and lower ends;

[0020] An insulating tube 7 with upper and lower ends opened in the ionization chamber 4, a ring-shaped transmission electrode group 4 is sleeved on the outer wall of the insulating tube 7, and a hole electrode 6 is arranged below the insulating tube 7, and the surrounding of the hole electrode 6 The edge is airtightly connected with the surrounding edge of the through hole on the lower wall;

[0021] A light source 1 is arranged above the ionization chamber 2, and the light outlet of the light source 1 faces the through hole ...

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Abstract

The invention provides an ionization source device based on charge saturation enhanced ion transmission. A hollow insulating tube is adopted as an ionization channel of a photoionization source and asample gas conveying pipeline; the mode greatly reduces the invalid volume in the ionization source, and has the following advantages that photoelectrons are not generated when the wall of the insulating tube is irradiated by light, so that the photoelectron ionization effect in other patents or research literatures can be effectively avoided, and ion fragments are reduced; a radial electric fieldis generated by utilizing the principle of charge accumulation balance of the insulating surface to hinder radial diffusion of ions; and when the pumping speed of the pump is not changed, the airflowspeed of the sample in the insulating pipeline is increased, the ion movement is pushed in the axis direction, and the ion transmission efficiency is improved.

Description

technical field [0001] The invention relates to the field of mass spectrometry, and in particular provides a photoionization source device that utilizes charge saturation to enhance ion transmission. The principle is to use the electric field generated by the accumulation of charges on the insulating surface to constrain the movement of ions, reduce the radial divergence of ions, and improve the transmission efficiency of ions in the ionization source. Background technique [0002] In the photoionization source of mass spectrometry, the sample enters the ionization chamber in the form of "overflow" through the capillary and diffuses in the effective cavity outside the electrode ring. The common structure of the photoionization source is composed of coaxial and evenly spaced superposition of electrode rings, such as the ionization source involved in patents CN200910248924.2 and CN201010567193.0. Under this structure, on the one hand, the size of the sample flow rate and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J49/16
CPCH01J49/161
Inventor 陈平花磊李海洋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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