Broadband adiabatic inversion pulses for cross polarization in wideline solid-state NMR spectroscopy.

ABSTRACT: Efficient acquisition of ultra-wideline solid-state NMR powder patterns is a continuing challenge. In particular, when the breadth of the powder pattern is much larger than the cross-polarization (CP) excitation bandwidth, transfer efficiencies suffer and experimental times are greatly increased. Presented herein is a CP pulse sequence with an excitation bandwidth that is up to ten times greater than that available from a conventional spin-locked CP pulse sequence. The pulse sequence, broadband adiabatic inversion CP (BRAIN-CP), makes use of the broad, uniformly large frequency profiles of chirped inversion pulses, to provide these same characteristics to the polarization transfer process. A detailed theoretical analysis is given, providing insight into the polarization transfer process in

SUBMITTER: Harris KJ 

PROVIDER: S-EPMC5081099 | biostudies-literature | 2012 Nov

REPOSITORIES: biostudies-literature