title: Strategies for high-resolution proton spectroscopy in solid-state NMR.
abstract: We describe radiofrequency (RF) pulse schemes in solid-state NMR applied to samples rotating at the magic angle (MAS) to obtain high-resolution (1)H spectra. Without combined RF schemes and MAS, (1)H spectra are normally severely broadened by the strong homonuclear proton-proton dipolar couplings. This review gives an outline of a representative class of multiple-pulse sequences, designed to work with and without MAS, and commonly used for high-resolution proton spectroscopy in solid-state NMR. We give a theoretical treatment of these sequences based on Floquet theory, both single-mode and bimodal. Using this approach, we define first-order homonuclear decoupling efficiency parameters which provide the line-narrowing characteristics of the various pulse sequences when applied to fast rotating samples. These parameters are used to compare the line-narrowing efficiencies of the multiple-pulse schemes.
authors.affiliation: Radiology Department, The Beth Israel Deaconess Medical Center, 330 Brookline Avenue, 02215, Boston, MA, USA.
authors.forename: Elena
authors.initials: E
authors.lastname: Vinogradov
authors.forename: P K
authors.initials: PK
authors.lastname: Madhu
authors.forename: Shimon
authors.initials: S
authors.lastname: Vega