Patent ID: 7276903
Filing Date: 2007-10-02
Classification: G01R

Abstract:
1. A method for obtaining a two-dimensional NMR (=nuclear magnetic resonance) spectrum of quadrupolar nuclei of 14 N having spin I=1 using magic angle spinning (=MAS) of a solid powder sample and transfer of coherence from a neighboring nucleus with spin S=½ to single- or double-quantum transitions of said quadrupolar nuclei of 14 N having spin I=1, wherein the detection of the spectrum occurs indirectly via the spin S=½ nuclei, wherein the transfer of coherence occurs through residual dipolar splittings, the method comprising the steps of: a) exciting the neighboring nucleus single quantum coherence; b) applying a delay of τ c) applying a first d) applying a π-RF-pulse to the neighboring nucleus with spin S=½ in a middle of an evolution interval t e) applying a second f) recording the signal of the neighboring nucleus with spin S=½ after a duration τ