Figure S 1: Hahn spin echo (top), gradient stimulated echo (middle) and Doneshot (bottom) pulse sequences, adapted from VnmrJ Liquids NMR User Guide (Varian).
“Oneshot” pulse sequence used here is based on the stimulated echo sequence, Errore. L’origine riferimento non è stata trovata..This sequence allows longer diffusion times (Δ) than for the original spin echo method, facilitating detection of hydrogens with short transverse relaxation times. It acquires one transient per gradient level and uses unbalanced bipolar pulse pairs and spoiler gradients to improve performance.
The observation time for diffusion (Δ) and gradient duration (\(\delta\)) duration are kept constant. This removes any contribution from relaxation. Decay in intensity (I) of each 1H signal as G strength increases is fit to the Stejskal-Tanner equation (Eq. 1).