Spectrus: Digital Resolution Limits and Appropriate Zero Filling in NMR Spectra

Description
Digital resolution (points per Hz) limits how finely peaks are sampled. Too few points can make closely spaced peaks appear as one. Zero‑filling can improve the appearance of resolution but cannot recover information beyond the original acquisition.

Solution

1. Check acquisition parameters:
   • Number of points and spectral width in Hz.
   • Digital resolution ≈ spectral width / number of points.
2. If peaks are poorly resolved digitally:
   • In Spectrus, apply zero‑filling to increase the number of points before Fourier transform. This interpolates data and can smooth the appearance of peaks and improve line shape visualization.
3. Understand limitations:
   • Zero‑filling cannot create real resolution that was not present in the original acquisition.
   • If two resonances are closer than the true resolution, they may still be indistinguishable.
4. For future experiments:
   • Increase acquisition time (more points) to improve true digital resolution, within practical limits.
5. In reports:
   • Avoid over‑interpreting tiny differences that may arise only from zero‑filling; base conclusions on clearly resolvable features.