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. 2017 Aug 11;3(8):e1701116. doi: 10.1126/sciadv.1701116

Fig. 3. Access to dipolar coupling between MTSSL spins.

Fig. 3

(A) Measurement of a triple-resonance frequency sweep on a few network spins (Figs. 1D and 2) with a π pulse width of 3.4 MHz. The swept frequency channel is SL 2, whereas SL 1 is kept at zero detuning to create a coherent superposition. The resulting spectrum can be fitted with two Lorentzians (red), as is expected from a pronounced J coupling between network spins. (B) Delay measurement on a the same environment, where we fix the excitation frequency of SL 1 at the network Larmor frequency and the SL 2 sweeping π pulse frequency 3 MHz apart from it. The red curve is a fit using a decaying cosine. The oscillations reveal the very same coupling strength as the frequency sweep in (A).