Figure 1.

C–H bond autocorrelation function g(τ). (A) Idealized illustration of the fast (white background) and the slow (green) mode of the correlation function in solid-state NMR experiments. The fast mode decays to a plateau on which g(τ) = S_CH², while the slow mode gives the final descent to zero. Oscillations at the slow mode region are due to magic-angle spinning. (B) Typical g(τ) obtained from an MD simulation, showing the decay toward S_CH². The gray area under the curve is equal to (1 – S_CH²)τ_e.