On the three-pulse excitation of spin echo signals
โ Scribed by A. S. Kim
- Book ID
- 110131147
- Publisher
- SP MAIK Nauka/Interperiodica
- Year
- 2002
- Tongue
- English
- Weight
- 37 KB
- Volume
- 44
- Category
- Article
- ISSN
- 1063-7834
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๐ SIMILAR VOLUMES
The signals in NMR spin echoes which are refocused by 90 degrees pulses are spatially modulated. The spatial modulation is not normally observed in images or profiles obtained using Hahn or stimulated echoes, but may cause errors if the sample structure varies on the distance scale of the modulation
The quadrupolar and dipolar interactions of spins during the radio frequency (RF) pulses are considered. It is shown that due to these interactions the two-pulse echo signal is observed at the shifted time t, = T + t,/2 (t, = width of the first RF pulse, 7 = time interval between the pulses).