Synclastic dual-channel time-of-flight mass spectrometer

Abstract

Provided is a synclastic dual-channel time-of-flight mass spectrometer. The mass spectrometer comprises collateral dual-channel accelerators (1), a minitype vacuum chamber body (2), a laser sputtering ion source (3), an ion signal detector (4), an ion signal detector (5), and an ion collimator (6). When ions generated by the laser sputtering ion source (3) enter into the dual-channel accelerators (1), the front segment and the rear segment are respectively accelerated to the ion signal detector (4) and the ion signal detector (5) for detection in the same direction. Ion beams generated by the ion source are segmented to an upper part and a lower part through a dual-channel time-of-flight mass analyzer by the collimator, and are respectively transversely accelerated, deflected and focused to the upper detector and the lower detector to record ion time-of-flight mass spectrometry. If the upper detector is replaced by an electron energy analyzer, then a photoelectron spectroscopy experiment for selecting some ions can be carried out at the same time. The synclastic dual-channel time-of-flight mass spectrometer is combined with the electron energy analyzer, and can quickly and conveniently carry out a laser irradiation experiment for ions of all mass peaks. The measured electron spectroscopy of a certain ion and mass peak time-of-flight of the certain ion have a strict corresponding relation. The whole instrument is compact, small and exquisite, simple in structure, and convenient to operate. More importantly, acquired ion electron spectroscopy signal to noise ratio is high, and resolution ratio is high.

Description

technical field [0001] The invention relates to the technical field of tandem time-of-flight mass spectrometry, in particular to a co-directional dual-channel time-of-flight mass spectrometer. Background technique [0002] Time-of-flight mass spectrometer is an instrument that records the charge-to-mass ratio of molecules. According to the information provided by the mass spectrum, it can perform qualitative and quantitative analysis of various organic and inorganic substances, structural analysis of complex compounds, determination of various isotope ratios in samples and solid surface structure and composition analysis. Photoelectron spectroscopy (or photoelectron imaging technology) is a beam of ultraviolet laser to irradiate molecules or ions, and the photoelectron speed generated is recorded, reflecting information such as electrons in molecular orbitals, vibrational or rotational energy levels, and structural types. Time-of-flight mass spectrometry has developed rapid...

AI Technical Summary

Problems solved by technology

This leads to the following weaknesses: In the research of pulse work, especially when using nanosecond laser to irradiate the ions in the "detection area" for research, good time focusing and spatial focusing characteristics are required

However, in the "detection area", because the time is more than 2 times wider than the "focus point", the spatial ion distribution volume is increased by at least 8 times, then the unit volume of ions in the "detection area" is compared to the "focus point" , whose intensity is at least an order of magnitude weaker, thereby reducing the acquisition efficiency, the signal-to-noise ratio of the electron signal, and the resolution of the electron energy

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