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- W1497332929 abstract "The evolution of a quadrupolar spin system under rf irradiation depends on the size of the quadrupolar Hamiltonian ℋQ with respect to the radiofrequency Hamiltonian ℋrf. In order to get quantitatively interpretable spectra, it is vital to understand how the effective pulse angle of specific spin transition varies with the strength of the rf field Ω1. By recording the NMR signal as a function of pulse length, nutation spectra are obtained whose appearance depends on the ratio . Detailed spectra are obtained in the regime 0.1 ≦≦ 10 allowing the determination of the quadrupolar parameters when Ω1 is known. The theory describing the nutation behavior of half-integer quadrupolar nuclei is discussed in detail together with a number of practical aspects that are vital to obtain meaningful results. A number of applications are reviewed with an emphasis to applications of nutation spectroscopy for studying nuclei experiencing large quadrupolar interactions, which cannot be studied using MQMAS or STMAS. Finally, it is shown that one can exploit the nutation effect for filtering NMR or MRI signals. This can be used to add a contrast function to images of quadrupolar spins or to selectively suppress the signal of specific isotopes on the basis of their spin-quantum number." @default.
- W1497332929 created "2016-06-24" @default.
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- W1497332929 date "2011-12-15" @default.
- W1497332929 modified "2023-09-25" @default.
- W1497332929 title "Quadrupolar Nutation SpectroscopyUpdate based on original article by Bernard C. Gerstein, Encyclopedia of Magnetic Resonance, ©1996, John Wiley & Sons Ltd." @default.
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- W1497332929 doi "https://doi.org/10.1002/9780470034590.emrstm0359.pub2" @default.
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