A new method of measuring nuclear magnetic moment.

Order of authorship in the original publication: Rabi, Zacharais,...Kusch.
Followed by:
(2) The magnetic moments of ₃Li⁶, ₃Li⁷, and ₉F¹⁹. Physical Review 53, 1938.
(3) The molecular beam resonance method for measuring nuclear magnetic moments: The magnetic moments of ₃Li⁶, ₃Li⁷, and ₉F¹⁹. Physical Review, 55, 1939, 526-535.
Discovery of Nuclear magnetic resonance, the foundation of magnetic resonance imaging (MRI). For this discovery Rabi was awarded the Nobel Prize in Physics in 1944.