Highest frequency or
wavenumber that can be characterized by sampling at a given rate in order to be able to fully reconstruct the signal without artefacts.
Note: The
Nyquist sampling theorem states that an FID or interferogram must be sampled at a rate at least twice the highest frequency in the FID or interferogram in order to reproduce the correct frequencies in an NMR or Fourier-transform infrared spectrum, respectively, without folding (folding (in spectroscopy)) artefacts.
\(f_{\rm{Nyquist}} = ½\nu\).
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 669 (https://doi.org/10.1515/pac-2019-0203)