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The AB (I=S=1/2) Spectrum

This tutorial demonstrates the primary effects of scalar coupling. When Dn/J between spins is not large (e.g. < 100) the spins are strongly coupled.

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Strong coupling influences both the transition intensities and the observed splittings, often making spectral interpretation more difficult. A weakly coupled homonuclear "AX" system has 4 transitions of equal intensity with both A and X signals split by the J value. Strongly coupled "AB" systems show variations from this, as is evident in the spectrum below. Unlike J, Dn increases with Bo so that strong coupling effects are diminished in high field spectrometers.

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