Line Narrowing by Multiple Pulse Techniques III. Experimental Aspects

  • U. Haeberlen
Part of the NATO Advanced Study Institutes Series book series (NSSB, volume 22)


A multiple pulse experiment starts with the selection of the sample — unless it is to be a mere test experiment. In that case the sample is usually a “single crystal of CaF2 doped with paramagnetic impurities and oriented with its (111)-axis along the applied field”! The following considerations influence the decision:
  1. (1)

    What is possibly interesting?

    For our current work we defined the determination of chemical shift tensors of protons in characteristic bonds (hydrogen, alephatic, aromatic, olefinic ... bond) as being interesting.

  1. (2)
    Which suitable compound contains protons in the desired bond? The emphasis is on ‘suitable’. What makes a compound suitable for a proton — multiple — pulse investigation?
    1. (a)

      The compound itself and the space group in which it crystallizes should be such that the spectrum is not overcrowded with lines.

      (Problem: What is the number of nmr-lines in a single crystal spectrum of a spin 1/2 nucleus?)

    2. (b)

      It is allowed to contain only a very limited selection of atoms, otherwise heteronuclear dipolar broadening is fatal. C, S, O, Ca are excellent, K and some others are tolerable.

    3. (c)

      It should be a solid at room temperature.



Pulse Train Pulse Investigation Malonic Acid Angle Error Phase Transient 


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Copyright information

© Plenum Press, New York 1977

Authors and Affiliations

  • U. Haeberlen
    • 1
  1. 1.Max Planck InstitutHeidelbergDeutschland

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