Encyclopedia of Biophysics

Living Edition
| Editors: Gordon Roberts, Anthony Watts, European Biophysical Societies

Pulsed Field Gradient

  • Kandala V. R. Chary
  • Atul K. Srivastava
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-35943-9_341-2
Pulsed field gradient (PFG) in NMR, as the name suggests, is a spatially dependent magnetic field (B g (r)) applied across the NMR sample volume, for a short duration (typically <10 msec), during which time the static magnetic field (B 0) becomes spatially inhomogeneous. Application of PFG for a short duration (δ) introduces a spatially dependent phase (Ф (δ, r)) in the transverse magnetization, which depends on B g(r) as well as on the gyromagnetic ratio (γ) and the coherence order (p) of the individual nucleus ( j) involved and is given by (Keeler et al. 1994)
$$ \Phi \left(\updelta, \mathrm{r}\right)=s\ {\mathrm{B}}_{\mathrm{g}}\left(\mathrm{r}\right)\ \updelta\ \sum \limits_j{\mathrm{p}}_j{\upgamma}_j $$
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Copyright information

© European Biophysical Societies' Association (EBSA) 2018

Authors and Affiliations

  1. 1.Department of Chemical SciencesTata Institute of Fundamental ResearchMumbaiIndia
  2. 2.Department of PathologyThe University of ChicagoChicagoUSA

Section editors and affiliations

  • Mitsu Ikura

There are no affiliations available