Measurement of Nuclear Magnetic Moments in Atomic Beams

THE purpose of this communication is to describe a magnetic resonance experiment which we have performed with three radio-frequency loops situated in the C field of an atomic-beam apparatus, and to propose an application. Apart from the three loops, we used a conventional ‘flop-in’ arrangement with short A and B magnets. The method to be described allowed the measurement in a short apparatus of transitions for which Δ m J = 0; such lines are usually unobservable except in machines with long A and B magnets 1 . The atomic beam was potassium-39, for which J = ½ in the ground-level and I = 3/2.