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| Titel: |
Rotational-resonance NMR experiments in half-integer quadrupolar spin systems |
| Auteur: |
NIJMAN, MELANIE ERNST, MATTHIAS KENTGENS, ARNO P. M. MEIER, BEAT H. |
| Verschenen in: |
Molecular physics |
| Paginering: | Jaargang 98 (2000) nr. 3 pagina's 161-178 |
| Jaar: |
2000-02-10 |
| Inhoud: |
The use of rotational-resonance experiments to achieve homonuclear polarization transfer between half-integer quadrupolar spins is proposed. We give a theoretical description for a homonuclear two-spin system in the framework of Floquet theory. Numerical simulations, as well as analytical Floquet calculations, were performed to analyse the behaviour of such a system. In most cases of practical relevance, the polarization transfer between the levels involved in the central transitions of the two coupled spins can be described by a pseudo-spin-1/2 formalism. While a rotational-resonance experiment at fixed spinning speed leads only to a partial polarization transfer, an adiabatic passage through the rotational-resonance condition, achieved by a spinning-speed ramp, promotes polarization transfer for all components of the second-order quadrupolar broadened line shape. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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