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When a magnet is set in an atomization section to apply a magnetic field to the atomic vapor, the absorption spectrum of the atomic vapor will be split, showing the polarization property. On the other hand, the background (BKG) is not affected by the magnetic field, showing neither a split nor the polarization property. It is the Zeeman correction method which uses this phenomenon.
For the component of the light source polarized parallel to the magnetic field, "π component atomic absorption + BKG absorption" is observed. However, only "BKG absorption" is observed for the component polarized vertically to the magnetic field. (Since the σ component, which causes atomic absorption is shifted from the measurement wavelength, it does not cause atomic absorption.)