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What does the spin-spin relaxation time T2 govern?

  • A.The chemical shift of the observed nucleus
  • B.The number of scans needed for a given signal to noise
  • C.The natural linewidth of the resonance
  • D.The intensity of the nuclear Overhauser effect

Answer: C

T2 measures the decay of transverse coherence, and the natural width of a line at half height is one divided by pi times T2. A short T2 therefore gives a broad line, which is why large molecules, viscous solutions and quadrupolar nuclei give broad spectra. In practice the observed width also includes field inhomogeneity, and the combined constant is written T2 star. Shift is a shielding matter, the Overhauser effect depends on dipolar relaxation pathways, and the scan count follows from sensitivity. Linewidth is the visible face of T2.

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