Polykarp Kusch was a notable American physicist born on January 26, 1911, and he passed away on March 20, 1993. He is best known for his work in the field of quantum mechanics and atomic physics, particularly for his contributions to the measurement of the magnetic moment of the electron. Kusch's research helped to improve the precision of the electron's magnetic moment, which is a fundamental property related to its spin and charge.
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Polykarp Kusch and Henry Michael Foley measured atomic magnetic resonance frequencies to determine the electron magnetic moment. Different quantum states weight orbital angular momentum and spin contributions differently, allowing ratios of magnetic responses to isolate the spin contribution. The inferred electron spin g-factor differs slightly from two. The Kusch-Foley magnetic moment experiment thus probes a microscopic interaction through accurately counted frequencies, rather than a mechanical measurement of an isolated electron.[ref]
A physicist.[ref]
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