Multiple spin echo formation (abstract)

Multiple spin echo formation for quadrupole nuclei (I≳1/2) in magnetics having inhomogeneous hyperfine and quadrupole interactions was investigated using two and three pulses technique. It was shown that the ‘‘forbidden’’ echo appearance is possible for the time intervals comparable with the characteristic times of the quardupole and hyperfine broadening. The amplitude drop when the time interval between exciting pulses increases is determined not by relaxation time (as usual) but by inhomogeneity having the larger characteristic time (HFI or quadrupole). Multiple spin echo signal for the two pulses technique is due to the transitions with quantum numbers m2≳m1.1 However, when three pulses technique with ‘‘unusual’’ exciting pulses sequence (τ12≳τ23) is used transitions with m1

Keywords:

• Quantum number
• Condensed matter physics
• Amplitude
• Nuclear magnetic resonance
• Hyperfine structure
• Quadrupole
• Spin echo
• Physics
• Relaxation (NMR)

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