Figure 19.

Variation of R₂ + R_ex with k_ex during an R_1ρ experiment when on-resonance with the ES (p_ES = 0.01, $\Delta \overline{\omega }{(}^{13}\text{C)}=3\text{\hspace{0.17em}ppm}$, γ(¹H)B₀/2π = 700 MHz, R_1,GS = R_1,ES = 2.5 s ⁻¹ and R_2,GS = R_2,ES =22.5 s⁻¹). Spin-lock amplitudes are color-coded. Vertical lines denote the indicated values of k_ex. The initial alignment of the magnetization during the B-M simulations was performed as described in Section 6.1.