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Constants and units

Constants and units

Physicists measure the fine structure constant directly for the first time

09 Dec 2022
Angle of rotation: A light source (left) sends a beam of light through a topological insulator with an intrinsic magnetic field (centre), changing the direction of polarization by an angle that is given by the fine structure constant. (Courtesy: Tatiana Lysenko / TU Wien)
The value of the fine structure constant – perhaps the most important constant in nature as it dic

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