Ion selectivity photodissociation device, ion selectivity photoionization method and instrument

Abstract

The invention discloses an ion selectivity photodissociation device, an ion selectivity photodissociation method and an instrument. The device comprises an electrode assembly, wherein the electrode assembly comprises a first electrode, a second electrode, a third electrode and a fourth electrode; the first electrode, the second electrode, the third electrode and the fourth electrode are sequentially arranged in parallel; a round hole is formed in the middle part of each electrode; in addition, centers of the round holes of all the electrodes are coaxial; a grid mesh is arranged on each round hole and used for allowing ions to pass through; the first electrode and second electrode form a quality gate; the quality gate is used for selecting ions with specific mass number; the second electrode and the third electrode form a dissociation zone; the dissociation zone is used for dissociating ions selected by the quality gate under the irradiation of dissociative laser to generate fragment ions; the second electrode, the third electrode and the fourth electrode form a two-stage acceleration electric field for accelerating the fragment ions, so that the fragment ions reach an ion detector microchannel plate. According to the device, high-resolution selection and analysis of ions generated by an ion source are realized.

Description

technical field [0001] The invention relates to the technical field of mass spectrometry and spectral analysis, in particular to an ion selective photodissociation device, a method for performing ion selective photodissociation through the device, and an instrument with the device. Background technique [0002] At present, as an outstanding representative of analytical and testing scientific instruments, mass spectrometers have the advantages of the highest sensitivity and the strongest applicability, and play an irreplaceable important role in scientific research and production practice. In mass spectrometry, after ionization, the molecules of the substance to be measured are distinguished and quantitatively analyzed according to the spatial position and time sequence under the control of the electromagnetic field according to different mass-to-charge ratios (ratio of mass to charge). Although mass spectrometry has powerful mass analysis functions, this technology has great...

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Problems solved by technology

However, due to the low sensitivity of the traditional infrared absorption spectroscopy method, it is not suitable to be used in series with mass spectrometry for material structure analysis.

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