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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.

spectra 3
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