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Magnetic field effects peak areas

Nuclear spins are sensitive to the chemical environment of a nucleus. Electrons moving near the nucleus establish an internal magnetic field that modifies the local effective field felt by each proton to a value different from that of the externally applied field. The resulting chemical shift causes protons within different structural units of the molecule to show NMR peaks at different values of magnetic field. All protons in chemically equivalent environments will contribute to a single absorption peak in the spectrum. The relative area under each absorption peak is proportional to the number of protons within each equivalent group. In order to standardize procedures, chemical shift values are recorded relative to the selected reference compound tetramethylsilane (TMS) by adding a very small amount of... [Pg.843]

If the direction of the effective magnetic field changes from point to point in a sample so that each direction has the same occurrence, then the relative peak areas (intensities) of the resultant sextet will average out to... [Pg.1419]

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See also in sourсe #XX -- [ Pg.300 ]



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Peak areas

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