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Physics Letters A

Rotary echoes due to magnetic dipolar interaction in a multi-level NMR system

H. Hatanaka

Published Nov 1, 1985• 2 citations
Publisher
DOI
10.1016/0375-9601(85)90718-2

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Two-quantum rotary echoes predicted by Bloch like equations for two-quantum transition have been observed in a multi-level NMR system of 27 Al nuclei in Al 2 O 3 . An rf field exactly at resonance to the two-quantum transition ( Δ m =2) was turned on at t =0 and its phase was shifted by 90° at t =τ. The echo at t =2τ was observed by using the technique of transfer of coherence reported previously. Characteristic dependence of the echo width upon inhomogeneity of rf field amplitude was confirmed experimentally.