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The ACS recently hosted a virtual conference and there was an interesting talk on NMR experiments using the Earth's magnetic field. What surprised me was the number of molecules studied with Earth's field NMR so far is around 22. Another interesting aspect was that NMR at low magnetic field strength is richer in the number of lines as compared to the extremely strong magnets used today. I think spectroscopists might be happier if they get a rich spectrum (good for finger printing).

This site has many NMR researchers, my question is why Earth's field NMR never caught up? The number of molecules studied so far is very low. Is it theoretically very challenging or the analytical sensitivity is hopelessly low?

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    $\begingroup$ Hmm, I have never been an NMR expert, but AFAIK, typical frequences for x T magnetic fields are tens of MHz, what may look like(low?) hundreds of Hz for Earth field. It may be technologically challenging to work quantitatively with such low frequencies. $\endgroup$ – Poutnik Aug 23 '20 at 16:33
  • $\begingroup$ Poutnik, I do not think technology is the issue. An Earth's field NMR for advanced physics teaching lab costs just < $ 10,000. $\endgroup$ – M. Farooq Aug 23 '20 at 19:45

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