Figure 2.

(A) Simulated ¹⁵N_free polarization as a function of CW RF field amplitude, v₁, and frequency offset from ¹⁵N_bound resonance, v_rf − v(¹⁵N_bound) for a [IrH₂S₂] SABRE complex, where S = ¹⁵N. Note that two distinct extrema occur, symmetric with respect to the frequency of the bound substrate, v(¹⁵N_bound). The maximum polarization for ${k^{\prime }}_d=30{\text{s}}^{-1}$, $W_a=k_d^{\mathrm{\text{'}}}/17$, t_CW = 1.17 s and n = 20 occurs at v₁=5 Hz and v_rf − v(¹⁵N_bound)=17 Hz. (B) Polarization of SLIC-SABRE as a function of $k_d^{\mathrm{\text{'}}}$ for an [IrH₂S₂] complex with S=¹H (red) and S=¹⁵N¹H (blue) and the “simple analytical SABRE formula” (dashed line).