Gradient enhanced NMR spectroscopy

Gradient Enhanced NMR Spectroscopy

Gradient enhanced NMR spectroscopy

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Gradient enhanced NMR is a method for obtaining high resolution nuclear magnetic resonance spectra without the need for phase cycling. Gradient methodology is used extensively for two purposes, either rephasing (selection) or dephasing (elimination) of a particular magnetization transfer pathway. It includes the application of magnetic field gradient pulses to select specific coherence s. By using actively shielded gradients, a gradient pulse is applied during the evolution period of the selected coherence to dephase the transverse magnetization and another gradient pulse refocuses the desired coherences remaining during the acquisition period.


  • Significant reduction in measuring time
  • Reduced T1 artifacts
  • Elimination of phase cycling and difference methods
  • Possibility for three and four-quantum editing
  • The ability to detect resonances at the same chemical shift as a strong solvent resonance


  • A need for field-frequency-lock blanking during long runs.


  • Selection of transverse magnetization (I<sub>x</sub>, S<sub>x</sub>, I<sub>y</sub> etc.):
(+)gradient      180°(x)      (+)gradient
  • Suppression of transverse magnetization (I<sub>x</sub>, S<sub>x</sub>, I<sub>y</sub> etc.):
(+)gradient      180°(x)      (-)gradient


  • Ralph E. Hurd, Gradient-Enhanced Spectroscopy, Journal of magnetic resonance. 87, 422-428 (1990)

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