Fig. 3
From: Quantum probe hyperpolarisation of molecular nuclear spins
Polarisation of external molecular 1H spins. a Cross-relaxation spectra near the 1H resonance (ωNV = 4.4 MHz), for a single NV spin located 10 nm below a PMMA layer, obtained using τ = 20 μs and N = 105 with the CRIP sequence (blue) and the depolarisation sequence (orange). b Cross-relaxation curves obtained by increasing τ at the 1H resonance with the CRIP sequence (blue) and depolarisation sequence (orange), and off-resonance to obtain the background relaxation rate (green). c Three-dimensional representation of the 1H spin polarisation distribution in PMMA on the surface of a diamond (blue block), calculated from Eq. (1) in the steady state
