Multispin Cross-Correlated Transverse Dipolar NMR Relaxation in Solution

Figure 2

The green points were calculated from equations (14) and (15) for dipolar-dipolar cross-correlation, while the solid black line was calculated using the “solid-state” approach (equations (21) and (22)). Fitting a single exponential against a complete cross-correlated relaxation curve (dashed line) yields an erroneous rate. In red is a relaxation curve calculated from the straight addition of R₂ (IS) and R₂ (IQ) (equation (1)). A (isotropic) rotational correlation time τ_c of 10 ns was used in all calculations.