It may come from just a liquid sample of water in which the hydrogen atoms give rise to the FID and the NMR spectrum. The FID decays with time (related to relaxation). A mathematic operation called ...

The NMR probehead must be tuned and matched because it is a resonance ... as a PDF or image file by clicking the hard drive button (top left) and choosing The FID can be manipulated in various ways ...

A frequently documented NMR spectrum is the 1D 13 C carbon spectrum, which is less sensitive than the 1 H spectrum. Proton decoupling during the FID acquisition can boost its sensitivity (Figure 1).

These facilities are available for fundamental studies in physicochemical and topochemical characterization of raw and processed biomass and their products (NMR, SEC, SEM/TEM, GC-MS/FID, HPLC) and ...