chemical shift

chemical shift2016-11-17T20:57:15+00:00

chemical shift


Definition In nuclear magnetic resonance, a chemical shift (CS) is the resonant frequency of a nucleus relative to a standard. In MR imaging, the shift corresponds to the change in Larmor frequency of a given nucleus when bound to different sites in a molecule, due to magnetic shielding effects of electron orbitals.

CSs are responsible for differences among various molecules, and different sites in the molecules in high-resolution magnetic resonance spectra. The CS is proportional to the strength of the magnetic field and usually specified in ppm (parts per million) of resonance frequency, relative to a standard. 


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