Added 1975-09-05 21:27:46
App Freshness



J.P.G. Malthouse
Post Date:
2016-10-27 09:27:46

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NMRQA is an App containing about a hundred revision questions and answers on NMR. This App is not intended for people who are not familiar with the basic concepts of NMR. It is intended for scientists and research students who are using NMR and want to check their knowledge of basic NMR facts, experimental parameters, signal processing, relaxation and methods of obtaining maximal signal-to-noise. It only gives short single or two sentence answers and so it is not intended to replace textbooks or user manuals but it may help you understand them.

It does not contain the material covered in most undergraduate lecture courses or elementary texts and it is limited to 1D NMR. Its focus is on practical aspects. It is hoped it will help you interact with NMR operators and set up your own NMR experiments. There is a list of the topics covered below.

Topics include:-
Larmour frequency and NMR operating frequency.
Chemical shift.
Gyromagnetic ratio.
Locking and shimming.
Sensitivity and natural abundance 1H,13C,15N, 19F and 31P.
Pulse widths.
Paramagnetic effects on signals.
T2 relaxation and optimum acquisition time.
Zero filling.
Folding and truncation.
Exponential multiplication and linebroadening.
T1 relaxation.
Ernst equation.
Optimising pulse rate and pulse angles.
Measuring T1 values using the progressive saturation technique.
Measuring T1 values using the inversion recovery technique.
Dummy scans.
Dipolar and CSA relaxation.
Effect of molecular size on dipolar and CSA relaxation.
Effect of magnetic field strength on dipolar and CSA relaxation.


  • NMRQA Screenshot
  • NMRQA Screenshot

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