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Proposed spectral-STFR pulse sequence. Spectral pre-winding pulses are used for both tip-down and tip-up excitations in this paper. (a) Steady-state spin path. The tip-down pulse “prephases” the spins to have a phase equal to the negative of half the accumulated free precession phase −θf/2 = ωTfree/2, where Tfree is the free precession time. After readout, the spin is tipped back to the z-axis by a pulse tailored to the phase θf/2. (b) Pulse sequence timing diagram.
