Ionize each component in the sample to produce ions with different charge-to-mass ratios, and form ion beams under the action of accelerated electric fields, which enter the mass analyzer. The electric field and magnetic field are used to cause opposite velocity dispersion-the slower ions in the ion beam deflect more after passing through the electric field, while the faster ions deflect less.

In the magnetic field, the ions are deflected with the opposite angular velocity vector, that is, the slow-moving ions are still deflected greatly, and the fast-moving ions are deflected very little; When the deflections of two fields compensate each other, their orbits intersect at one point.

At the same time, mass separation can also occur in the magnetic field, so that ions with the same mass-to-charge ratio but different speeds focus on the same point, and ions with different mass-to-charge ratios focus on different points to obtain mass spectra respectively, thus determining their mass.

Extended data:

Application of mass spectrometry;

Mass spectrometry is an identification technology, which plays a very important role in the identification of organic molecules. It can quickly and accurately determine the molecular weight of biological macromolecules, and make protein Group research go deep from protein identification to advanced structure research and interaction research between various protein.

With the development of mass spectrometry technology, the application field of mass spectrometry technology is more and more extensive. Mass spectrometry is widely used in chemistry, chemical engineering, environment, energy, medicine, sports medicine, criminal science and technology, life science, material science and other fields because of its advantages of high sensitivity, low sample consumption, fast analysis speed and simultaneous separation and identification.

Baidu encyclopedia-mass spectrometry

Baidu encyclopedia-mass spectrometry