论文标题
零场核磁共振中的二维单量子和多量子相关光谱
Two-Dimensional Single- and Multiple-Quantum Correlation Spectroscopy in Zero-Field Nuclear Magnetic Resonance
论文作者
论文摘要
我们使用\ rb蒸气电池磁力计介绍单量和多量子相关$ j $ -spectRoscopy（$ <\！\！\！\！1 $〜$ $ g）磁场。在零场，乙醇的光谱似乎是\碳同位素剂的混合物，相关光谱对于分离两个复合光谱很有用。我们还识别并观察了$ {}^{13} $ c $ _2 $乙酸的零场等效物，并表明此类过渡在频谱分配中使用。二维光谱进一步改善了在零场NMR中获得的高分辨率，因为相干转移途径的选择规则可以将原本重叠的共振分离为不同的交叉峰。
We present single- and multiple-quantum correlation $J$-spectroscopy detected in zero ($<\!\!1$~$μ$G) magnetic field using a \Rb vapor-cell magnetometer. At zero field the spectrum of ethanol appears as a mixture of \carbon isotopomers, and correlation spectroscopy is useful in separating the two composite spectra. We also identify and observe the zero-field equivalent of a double-quantum transition in ${}^{13}$C$_2$-acetic acid, and show that such transitions are of use in spectral assignment. Two-dimensional spectroscopy further improves the high resolution attained in zero-field NMR since selection rules on the coherence-transfer pathways allow for the separation of otherwise overlapping resonances into distinct cross-peaks.
