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 top transmission electrode, a multi-pole rod electrode and a modified outlet electrode which are sequentially arranged from top to bottom, and through holes are axially formed in the top transmission electrode and the modified outlet electrode; the ultraviolet light source is arranged at the top through hole of the top transmission electrode and is used for irradiating ultraviolet light to the ionization region; the upper end of the top transmission electrode is provided with a top cover electrode light-blocking insulation pad, and the top cover electrode light-blocking insulation pad is used for blocking irradiation of ultraviolet light of an ultraviolet light source to the top transmission electrode; a multi-pole electrode insulation pad is arranged between the top transmission electrode and the multi-pole rod electrode; and a light blocking pipe is arranged on the inner side of the multi-pole rod electrode and used for blocking irradiation of ultraviolet light of the ultraviolet light source to the multi-pole rod electrode. According to the invention, not only can photoelectron generation be inhibited and a single single-photon ionization path be ensured, but also 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 ...

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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

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