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Sector Field MS Description

Simulate the separation of ions of different masses in a magnetic sector field

The magnetic sector field is - among other principles such as electric quadrupole fields, or flight time measurements - one of the most often used principles for commerical mass spectrometers. The principle is easy to understand: a beam of accelerated ions is directed into a magnetic field whose orientation is perpenticular to the beam. The magnetic field thus forces the charged particles on different circular trajectories, whose radii depend on the strength of the magnetic field, the accelerating voltage, and on the mass of the particular ion.

Keeping all but the magnetic field constant results in a separation of the ions according to their mass. Since the detector has a narrow entry split, it "sees" only a small fraction of the entire ion beam fan, i.e. those ions which travel along the circular trajectory connecting both the exit slit of the ion source and the entry slit of the detector. All other ions collide with the inner wall of the evacuated separation system (a small rectangular tube of non-magnetic material).

The program ms_sectorfield simulates the separation of ions of different masses in a magnetic sector field. The user can adjust both the accelerating voltage and the magnetic field strength, and select from a small number of substances, whose mass spectra have been provided by NIST (courtesy S. Stein of NIST).

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