= Nuclear magnetic resonance fingerprint of superfluid helium-3
Transverse <nuclear magnetic resonance> measures absorption from a radio-frequency <magnetic field> perpendicular to the static field. In the A phase, the resonance moved above the <Larmor frequency>; in the B phase it returned to that frequency despite the changed state. <Anthony James Leggett> connected the shift to collective spin-orbit structure. A predicted longitudinal resonance, driven parallel to the static field, supplied a further B-phase test.<Nobel Lecture: Superfluid 3He: the early days as seen by a theorist by Anthony James Leggett>[pp.1002–1003 and1009, transverse geometry and longitudinal test]{ref}
The <helium-3 superfluid discovery experiment> establishes why a new phase was inferred; comparing response channels then tests its internal structure. An unchanged peak in one geometry cannot, by itself, establish that nothing ordered.
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