The Hanle effect (also known as zero-field level crossing) is a reduction in the polarization of light emitted by atoms excited by polarized light, when subjected to a magnetic field. Typically, when atoms are excited by linearly polarized light, the emitted fluorescence is also polarized.
The Hanle effect (also known as zero-field level crossing) is a reduction in the polarization of light emitted by atoms excited by polarized light, when subjected to a magnetic field. Typically, when atoms are excited by linearly polarized light, the emitted fluorescence is also polarized.
Source: Wikipedia "Hanle effect" · CC BY-SA 4.0
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