Study of a spin-3/2 system by a quadrupolar-echo sequence: suppression of spurious signals.
作者： Pascal P. Man
DOI: 10.1016/0926-2040(92)90015-2
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摘要: Abstract The density matrix describing the evolution of a spin - 3 2 system excited by quadrupolar-echo sequence consisting two rf pulses in quadrature phase, {X}-τ2-{Y}-τ4-[acquisition(y)], is calculated from equilibrium state to acquisition period. interactions involved are first-order quadrupolar interaction throughout experiment and local heteronuclear magnetic dipolar term between during Three echoes, one due satellite transition at τ4 = τ2 central 3τ2, predicted. They have similar expressions than those obtained with same {X}-τ2-{X}-τ4-[acquisition(y)], except signs. Moreover, it shown experimentally that combination these sequences, namely: {X}-τ2-{X}-τ4-[acquisition(y)]-recycledelay-{X}-τ2-{−X}-τ4-[acquisition(y)]-recycledelay-{X}-τ2-{Y}-τ4-[acquisition(−y)]-recycledelay-{X}-τ2-{−Y}-τ4-[acquisition(−y)]-recycle delay, cancels spurious piezo-electric signals when studying ferro-electric material single-crystal form.
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