Continuous Wave (CW) vs. Pulse/Fourier Transform
NMR Sensitivity Issue
A frequency sweep (CW) to identify
resonance is very slow (1-10 min.)
Step through each individual
frequency.
Pulsed/FT collect all frequencies at
once in time domain, fast (N x 1-10 sec)
Increase signal-to-noise (S/N) by
collecting multiple copies of FID
and averaging signal.
S/N r number
of scans
%
