A Novel Dipolar Dephasing Method for the Slow Magic Angle Turning Experiment

• Published in: Journal of magnetic resonance (1997) Vol. 152; no. 1; pp. 7 - 13
• Main Authors: Hu, Jian Zhi, Taylor, Craig M.V., Pugmire, Ronald J., Grant, David M.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.09.2001
• Subjects: Carbon Isotopes - chemistry; Magnetic Resonance Imaging; Physical Phenomena; Physics; Rotation; chemical shift tensor; dipolar dephasing in slow MAT experiments; FIREMAT and 2D-PASS
• ISSN: 1090-7807; 1096-0856
• DOI: 10.1006/jmre.2001.2380

Complete suppression of the resonances from protonated carbons in a slow magic angle spinning experiment can be achieved using five dipolar dephasing (Five-DD) periods distributed in one rotor period. This produces a spectrum containing only the spinning sidebands (SSB) from the nonprotonated carbons. It is shown that the SSB patterns corresponding to the nonprotonated carbons are not distorted over a wide range of dipolar dephasing times. Hence, this method can be used to obtain reliable principal values of the chemical shift tensors for each nonprotonated carbon. The Five-DD method can be readily incorporated into isotropic–anisotropic 2D experiments such as FIREMAT and 2D-PASS to facilitate the measurement of the 13C chemical shift tensors in complex systems.