DescriptionA team at LKB (Laboratoire Kastler Brossel) in Paris used atom-interferometry measurements of the recoil velocity of rubidium atoms to determine the fine-structure constant to a relative uncertainty of about 8.1 x 10^-11 in 2020, one of the most precise independent determinations of alpha, providing an important cross-check against the value derived from electron g-factor measurements.
Formal questionThe smallest fractional uncertainty achieved by an independent experimental method (atom interferometry) for determining the fine-structure constant, alpha, a dimensionless fundamental constant governing the strength of electromagnetic interaction.
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