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).