Nota de FísicaPublicado
Spin Echo Amplitude in Pulsed NMR: Effects of Electric Quadrupole Interaction
R. R. Sobral; X. A. Silva; A. P. Guimarães
1986
Dados da publicação
- Autores
- R. R. Sobral; X. A. Silva; A. P. Guimarães
- Tipo
- Nota de Física
- Status
- Publicado
- Data de publicação
- 1986
- Descrição
- In ferromagnetic systems where the NMR spectra present unresolved electric quadrupole interactions the spin echo amplitude shows an oscillatory behaviour as a function of the time separation <math>\tau\,\!</math> between excitation pulses. These oscillations are in general attenuated. In the present work spin echo amplitudes are numerically computed, using a simple algorithm. The calculation is made for several values of the nuclear spin I and for different excitation conditions. The curves are compared with available analytical calculations. The amplitudes of the multiple spin echoes (for I > 1) are also obtained. The calculation is extended to the case of non-axially symmetric electric field gradients (EFG's) and to inhomogeneous EFG's; the attenuation in the corresponding amplitudes confirms that these conditions explain curves observed experimentally.
- Ano
- 1986
- Número
- CBPF-NF-049/86
- Vínculo com tese
- Não
- Vínculo com bolsa
- Não