Photoelectron suppression ionization source device

Abstract

The invention belongs to the technical field of mass spectrum ion sources, and particularly relates to a photoelectron suppression ionization source device. The device comprises an ultraviolet light source, a transmission electrode, an outlet electrode and an insulating light blocking device, through holes are axially formed in the transmission electrode and the outlet electrode, the outlet electrode is arranged at the bottom of the transmission electrode, the ultraviolet light source is arranged at the through hole in the top of the transmission electrode, the transmission electrode is used for ion transmission, and the outlet electrode is used for vacuum difference; and the insulating light blocking device is used for separating the transmission electrode from the outlet electrode and blocking irradiation of ultraviolet light of the ultraviolet light source to the transmission electrode and the outlet electrode. According to the invention, photoelectron generation can be inhibited, a single single-photon ionization path is ensured, ion focusing can be realized, the ion transmission efficiency is improved, and the dynamic interval of sample determination is effectively improved.

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 purpose of the present invention is to provide a photoelectron suppression ionization source device to solve the existing ionization technology in addition to other ionization pathways other than photoionization, so that the linear dynamic range of sample determination is narrowed, and high pressure The problem of photoionization under low sensitivity due to the reduction of ion transmission efficiency

Images