Nyquist frequency

symbol: $f_{\rm{Nyquist}}$
https://doi.org/10.1351/goldbook.08276
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 [Terms] [Paper]