A variation of the cross polarization (CP) experiment is discussed. The method requires two scans where the difference signal is equivalent to the I spin magnetization that is transferred to the S spins. The acquired signal is equivalent to F1 sum projection of a two-dimensional (2D) heteronuclear correlation experiment and is obtained by just two scans without the need to increment the indirect time domain t(1). Any polarization transfer method and any kind of spin manipulations during the t(1) incrementation period of a 2D NMR experiment can be applied. The method allows fast measurements of the CP transfer, particularly if various S spins signal overlap and is good for spectral editing of I spin signals with contact to S spins. Various examples for biomaterials are presented. Most importantly, this novel approach is ideal for detailed investigations of organic-mineral interfaces in bone, here demonstrated for O-phospho-l-serine as simple model compound.

中文翻译：

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在极化转移实验中使用丢失的I自旋磁化强度的固态NMR光谱。

讨论了交叉极化（CP）实验的一种变体。该方法需要进行两次扫描，其中差信号等于传递给S自旋的I自旋磁化强度。采集的信号等效于二维（2D）异核相关实验的F1和投影，仅通过两次扫描即可获得，而无需增加间接时域t（1）。可以应用2D NMR实验的t（1）递增周期内的任何极化转移方法和任何类型的自旋操作。该方法可以快速测量CP传输，特别是在各种S自旋信号重叠的情况下，尤其适合与S自旋接触的I自旋信号的频谱编辑。提出了生物材料的各种例子。最重要的是，