Device and method for improving abundance sensitivity of magnetic mass spectrum

Abstract

The invention provides a device for improving abundance sensitivity of a magnetic mass spectrum. The device comprises an ion speed-reducing lens, a quadrupole rod mass analyzer, an ion acceleration lens and a terminal ion prober; suspension voltage of the quadrupole rod mass analyzer is 1-100V lower than suspension voltage of an ion source of a magnetic mass spectrometer; and an ion deceleration lens is arranged at the tail end of the magnetic mass spectrometer. According to the device provided by the invention, the device for improving the abundance sensitivity of the magnetic mass spectrum and a corresponding method can be established based on the character that a mechanism of carrying out mass distinguishing on electrified particles by a quadrupole rod is only related to a mass-to-charge ratio. The device is in butt joint with the given magnetic mass spectrum type instrument, so that an abundance sensitivity index of the conventional instrument is improved by more than 1000 times.

Description

technical field [0001] The invention belongs to the performance improvement technology of mass spectrometry instruments, can be applied to the field of mass spectrometry instrument development, relates to the working principle and structure of mass spectrometer instruments, and specifically relates to magnetic mass analyzers, electrostatic deflection fields, quadrupole mass analyzers and cascade mass spectrometers (also known as mass spectrometers) The working principle of the instrument is called tandem mass spectrometry. Background technique [0002] Mass spectrometry is an important branch of contemporary science and technology. The main content it studies is the physical phenomenon that charged atoms or molecules are separated according to the difference in mass-to-charge ratio in the electromagnetic field. By changing the electromagnetic field according to certain parameters, the mass-to-charge ratio spectra of charged atoms and molecules with different mass-to-charge ...

AI Technical Summary

Problems solved by technology

[0010] The disadvantage of the above two technologies of electrostatic field and retardation lens is that they have no mass selection ability, so these two technologies can only screen for the energy and flight direction of ions, and the abundance sensitivity of magnetic mass spectrometers is also limited by particle scattering, narrow Due to the influence of other conditions such as cracks, the limit of the above two techniques for increasing the sensitivity of abundance is expected to be 1×10 -8 nearby

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