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. 2017 Aug 4;8:188. doi: 10.1038/s41467-017-00266-4

Fig. 3.

Fig. 3

Nanoscale NMR. a Sensing protocols: optical pulses are used to pump and probe NV spin state via the spin-dependent fluorescence; microwave multipulse sequences are applied between optical pump and probe pulses. Red and blue color indicates different microwave phases, which are shifted relative to each other by 90°. NV centers are resonantly tuned to detect a particular nuclear species by setting 4τ = τL, where 2τ is the separation between π-pulses and τL is the nuclear precession period. In order to reject common-mode noise the sequences are repeated with the phase of the last π/2-pulse shifted by 180°. The resulting signals are then subtracted and normalized to give the measurement results. b Time-domain NMR signal for 19F nuclei in Fomblin® oil taken using XY8-13 correlation sequence. c 19F frequency-domain NMR signal at B0 = 47.1 mT obtained by Fourier transform of the data in b. d Measured 1H and 19F gyromagnetic ratios at different B0 values. Dashed lines are literature values51. Error bars represent standard error of the mean