Radio frequency enhanced reaction photoinduced chemical ionization source

Abstract

The invention relates to a mass spectrometry instrument, and particularly relates to a radio frequency enhanced reaction photoinduced chemical ionization source for mass spectrometry. The radio frequency enhanced reaction photoinduced chemical ionization source mainly structurally comprises an ultraviolet light source, a convergent lens, a reagent molecule sample injection tube, an ion generationregion, a sample molecule sample injection tube, a conical radio frequency tripolar rod ion reaction region, an ion extraction electrode and the like. The ultraviolet light source is used for generating reagent ions during ionization, the reagent ions can be flexibly selected, and the universality is good; the ion collision frequency is improved through the conical radio frequency tripolar rod under medium air pressure, the focusing performance and the like are enhanced, the ion transmission efficiency and the molecular ion reaction probability can be improved, the ionization efficiency of thephotoinduced chemical ionization source is enhanced, and then the detection sensitivity of the instrument is improved.

Description

technical field [0001] The invention relates to a mass spectrometer analysis instrument, in particular to a radio frequency enhanced reaction photochemical ionization source. The ionization uses the ultraviolet light source to generate reagent ions, and through the tapered radio frequency triple pole to increase the ion collision frequency under medium pressure, enhance the performance of focusing, improve the transmission efficiency of ions and the probability of molecular ion reaction, and realize the photochemical ionization source The enhancement of ionization efficiency improves the detection sensitivity of the instrument. Background technique [0002] Soft ionization mass spectrometry has gradually become one of the main technologies for online monitoring and rapid analysis of VOCs in complex samples due to its advantages such as simple spectra and fewer overlapping peaks. Photoionization is a commonly used mass spectrometer soft ionization technique, and its commonly...

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Problems solved by technology

[0004] However, the ionization source ion generation area and the ion-molecule reaction area for ionization of sample molecules are in the same area, and the generation of reagent ions and the conditions (pressure, voltage, etc.) for chemical ionization of sample molecules cannot be optimized separately; The reaction area adopts a uniform electrostatic field transmission design. With the increase of air pressure, the divergence caused by ion collision is serious, and the electrostatic field is difficult to effectively restrain it, and the ion transmission efficiency is low.

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