The fine structure constant is a fundamental constant of nature and its measurement is crucial in physics. Recently, researchers at TU Wien have discovered a unique way of measuring it. The value of one over 137, also known as the fine structure constant, is considered a crucial number in physics.
A light source sends a beam of light through a special material, which changes the direction of polarization — by an angle that is given by the fine structure constant. Credit: Tatiana Lysenko / TU Wien
While traditionally the fine structure constant is measured indirectly through calculations and measurements of other physical quantities, researchers at But usually, when the fine structure is measured, various quantities with different physical units have to be measured, and then the value of the fine structure constant is inferred from these results. “In our experiment, on the other hand, the fine structure constant itself becomes directly visible,” says Andrei Pimenov.A laser beam is polarized linearly — the light oscillates exactly in the vertical direction.
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