NMR CROSS-POLARIZATION BY ADIABATIC PASSAGE THROUGH THE HARTMANN-HAHN CONDITION (APHH)
NMR CROSS-POLARIZATION BY ADIABATIC PASSAGE THROUGH THE HARTMANN-HAHN CONDITION (APHH)
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DOI：
10.1016/0009-2614(94)00470-6
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发表时间：
1994-06-24
影响因子：
2.8
通讯作者：
ERNST, RR
中科院分区：
文献类型：
--
作者：
HEDIGER, S;MEIER, BH;ERNST, RR
结果表明，通过哈特曼-哈恩条件对射频振幅进行绝热扫描，可以提高旋转坐标系中的异核交叉极化效率。对于与外部自旋具有弱偶极耦合的强耦合IS自旋系统，这种增强尤其显著。在射频场幅的切向时间依赖关系下，获得了绝热传输的良好近似，从而有效地抑制了瞬时振荡。
It is shown that the heteronuclear cross-polarization efficiency in the rotating frame can be improved by sweeping the radio-frequency amplitude adiabatically through the Hartmann-Hahn condition. The enhancement is particularly significant for strongly coupled IS spin systems with weak dipolar coupling to extraneous spins. A good approximation to an adiabatic transfer is obtained with a tangential time dependence of the radiofrequency field amplitude whereby transient oscillations are efficiently suppressed.