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Pulse Sequences


The CPMAS experiment is generally used to assist in the observation of dilute spins (most commonly 13C) by the transfer of magnetization from a nearby network of abundant spins (such as 1H). The whole time the sample is undergoing magic angle spinning which is an invaluable line narrowing technique. CPMAS is one of the most widely used experiments in solid-state NMR.

spectra 313C CP/MAS spectrum of caffeine. At 21.1 T note absence of the line splitting due to the dipolar coupling with the quadrupolar 14N. At lower magnetic fields such coupling results in very complicated spectra.

September, 2005



spectra 413C CP/MAS spectrum of tetracycline hydrochloride. Resonances from all 22 carbon atoms are resolved.

September, 2005


spectra 3
19F-13C CP MAS spectrum recorded for a hydrated Nafion film. In such high-resolution spectra various C-F species can readily be identified. Experiments performed by Shane Pawsey (the 900 Facility) with the 2.5 mm MAS probe.

October, 2006