A Time-of-Flight Mass Spectrometer with Broad Energy Focusing Reflector

Abstract

The invention provides a wide energy focusing reflector design method for the time-of-flight mass spectrum. For ions in wide energy distribution, all-stage electric field dimensions of a reflector formed by multi-stage electric fields and voltages for loading by all polar plates are designed by using a numerical computation method, so that ion time-of-flight focusing can be realized and thus the resolution rate of the time-of-flight mass spectrum can be improved. The machining and assembly accuracy requirements are low by the reflector. For the reflector, a grid mesh between each two stages of electric fields can be avoided and only the first two stages of grid meshes are kept, so that the reflector can have high ion transport efficiency. And the influence caused by electric field leakage can be compensated by a fine tuning voltage.

Description

Technical field [0001] The invention belongs to the technical field of mass spectrometers, and can be applied to the design of reflective time-of-flight mass spectrometers, and in particular relates to a reflector in a time-of-flight mass spectrometer, which can realize time-of-flight focusing of ions with a wide energy distribution. Background technique [0002] The resolution of the time-of-flight mass spectrum is R=t / 2Δt, where t is the average time of ion flight, and Δt is the time difference of ion flight. The flight time difference of ions increases with the increase of the energy dispersion of the ion, so the energy dispersion of the ion is a main factor that affects the resolution of the time-of-flight mass spectrometer. [0003] The use of reflectors in the time-of-flight mass spectrometer can achieve energy time focusing, thereby improving the resolution of the time-of-flight mass spectrometer. At present, the design method of the reflector in the time-of-flight mass spe...

AI Technical Summary

Problems solved by technology

However, since the time-of-flight varies monotonously with respect to energy before or after the central energy, the total time-of-flight difference will increase rapidly when the ion energy further deviates from the central energy, resulting in a rapid decrease in resolution

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