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What sets the digital resolution of a Fourier transform spectrum?

  • A.The number of scans co-added into the record
  • B.The strength of the applied magnetic field alone
  • C.The width of the excitation pulse in microseconds
  • D.The reciprocal of the acquisition time

Answer: D

Digital resolution in hertz per point is one divided by the acquisition time, so a one second acquisition gives one hertz per point and a four second acquisition a quarter of that. Scans add signal but not resolution, the field sets dispersion rather than digitisation, and the pulse width sets the excitation bandwidth. To resolve a small coupling the acquisition must be long enough, which in turn requires the relaxation to be slow enough for signal to remain. Resolution and sensitivity again pull against each other.

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