= Terry Gullion
{c}
\b[Terry Gullion] is a physical chemist whose work develops <solid-state nuclear magnetic resonance>. With <Jacob Schaefer>, he developed <rotational-echo double resonance>, or <REDOR>, which restores sensitivity to heteronuclear <NMR dipolar coupling> in a spinning solid. His first-person retrospective describes the method as a way to measure couplings and infer structural information.<Recollections of REDOR by Terry Gullion>[Original author abstract and1989-paper commentary relationship]{ref}<Development of REDOR rotational-echo double-resonance NMR by Jacob Schaefer (2011)>[2011 first-person retrospective on the1989 Gullion–Schaefer report]{ref}
Institutional profile: https://www.chemistry.wvu.edu/directory/professors/terry-gullion
The physical problem is that <magic angle spinning> suppresses interactions that broaden spectra but can also remove useful structural information. <REDOR> uses controlled pulse timing to reintroduce a selected interaction. A paired acquisition compares a reference signal $S_0$ with a dephased signal $S$ under matched conditions. Varying the evolution time supplies more information than a single intensity difference.<Development of REDOR rotational-echo double-resonance NMR by Jacob Schaefer (2011)>[Pulse-train development, magic-angle spinning and dipolar recoupling discussion]{ref}
For an original arithmetic example, $S_0=100$ and $S=72$ give fractional dephasing $(S_0-S)/S_0=0.28$. This does not directly mean that 28 percent of the atoms occupy a particular state. Structural inference requires an appropriate spin model, evolution times and controls on the acquisition. The example shows the inferential step that Gullion's method makes possible: a controlled change in a spectrum can encode an otherwise hidden interaction.
Back to article page
