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Pulse Sequences
Solid-Echo
The
broad lines typically observed in solids NMR have rapidly decaying Free Induction
Decays which are often incompletely recorded due to probe ringing. This delay
can lead to a significant part of the FID not being recorded resulting in
not just the loss of signal intensity but spectral distortion as well. This
problem can be overcome with the solid-echo pulse sequence that refocuses
the transverse magnetization.
Another example when NMR experiments with low-gamma low-sensitivity quadrupolar
nuclei, here Sr-87, performed at 21 T in a straightforward simple manner.
Done by V. Terskikh (the 900 Facility) with a home-built 5 mm solenoid probe.
January, 2007