COHERENT SCATTERING METHODS IN SOLID STATE NMR

相干散射的一种形式可以在磁场中建立。 通过脉冲磁场梯度的相互作用产生共振， 相干平均法 考虑一个梯度为 仅限于RF脉冲之间，则当梯度 在固体或魔法的演化时间内， 回波序列，该相移依赖于有效的重新聚焦 允许降低相干平均的对称性， 残余偶极耦合具有各向异性依赖于 耦合自旋的位置。 我们试图利用这种现象 创建一个相干的NMR散射测量， 沿梯度轴沿着测量核间距。 我们正在使用 稀释2-自旋体系中1-键距的作图方法 通过双量子过滤偶极耦合交换。

A form of coherent scattering can be established in magnetic resonance through the interplay of pulsed magnetic field gradients and coherent averaging methods. Consider a sequence where the gradient is restricted to being between RF pulses, then when the gradient evolution is significant during the evolution time of a solid or magic echo sequence, this phase shift dependence of the effective refocusing permits the symmetry of coherent averaging to be reduced and hence the residual dipolar coupling has an anisotropic dependence on the locations of coupled spins. We are using this phenomena in an attempt to create a coherent NMR scattering measurement that will directly measure internuclear distances along the gradient axis. We are using the methods to map out the 1-bond distance in a dilute 2-spin system via double quantum filtered dipolar coupled exchange.