A photoelectron suppression ionization source device

Abstract

The invention belongs to the technical field of mass spectrometry ion sources, in particular to a photoelectron suppressed ionization source device. It includes an ultraviolet light source, a top transmission electrode, a multi-pole rod electrode and a modified outlet electrode arranged in sequence from top to bottom, wherein the top transmission electrode and the modified outlet electrode have a through hole in the axial direction; the ultraviolet light source is arranged at the top of the transmission electrode. The top through hole is used to irradiate ultraviolet light to the ionization area; the upper end of the top transmission electrode is provided with a top cover electrode light-blocking insulating pad, and the top cover electrode light-blocking insulation pad is used to block the radiation of ultraviolet light from the ultraviolet light source to the top transmission electrode. The multi-pole electrode insulation pad is arranged between the top transmission electrode and the multi-pole electrode; the inner side of the multi-pole electrode is provided with a light blocking tube, which is used to block the radiation of the ultraviolet light from the ultraviolet light source to the multi-pole electrode. According to. The invention can not only suppress photoelectron generation and ensure a single single-photon ionization pathway, but also realize ion focusing, improve ion transmission efficiency, and effectively improve the dynamic range of sample determination.

Description

technical field [0001] The invention belongs to the technical field of mass spectrometry ion sources, in particular to a photoelectron suppressed ionization source device. Background technique [0002] Vacuum ultraviolet light can single-photon ionize organic molecules whose ionization energy is lower than its photon energy, mainly producing molecular ions, almost no fragment ions, simple spectrum, and fast qualitative and quantitative analysis according to molecular weight and signal intensity, but only Ionization Molecules with ionization energies lower than photon energies have a limited range of analytes. Different ionization sources can be developed by using the photoelectrons generated by the vacuum ultraviolet light source in the reagent area, such as: photoelectron ionization source, single photon-chemical ionization and single photon-chemical ionization source enhanced by radio frequency electric field. By adjusting the electron energy, the ionization range of the ...

AI Technical Summary

Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a photoelectron suppression ionization source device to solve the existing ionization source device, photoelectrons cause other ionization pathways except photoionization when they pass through the electric field, so that the linear dynamic range of sample determination Narrowing, and photoionization under high pressure will cause a decrease in sensitivity due to the decrease in ion transmission efficiency

Images