Effects of dipolar dephasing on deuterium multiple pulse quadrupolar echoes
✍ Scribed by Marco L.H. Gruwel
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 441 KB
- Volume
- 191
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Multiple pulse quadrupolar echoes are used to study the effects of heteronuclear dipolar dephasing on the 2H transverse magnetization. It is shown that the effects of motional averaging and dipolar dephasing on the 2H echo amplitudes can be distinguished on grounds of their dependence on the pulse spacing in the MW-4 multiple pulse sequence. Both motional averaging, with typical correlation times of approximately l 0-7< re ~ 10 -4 s, and dipolar dephasing can affect the 2H line shape in a similar way. The dipolar dephasing results in a decay rate of the echo amplitudes which depends on a term linear in the pulse cycle time. For motional averaging this term is quadratic in the slow and intermediate exchange regime.