Abstract
We report the first measurements of the NMR frequency in 3He A and B under conditions where the net magnetization, M , is tipped far from its equilibrium direction along H O. In 3He A the frequency shift ω - γ H O varies from the continuous wave value at tipping angle Φ = 0 to a negative shift at Φ = 180°. In 3He B no frequency shift is observed, however for Φ ≳ 100° a beat pattern is seen to develop in the free induction decay envelope.
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