化学
魔角纺纱
未成对电子
核磁共振波谱
核磁共振
光谱学
原子物理学
魔法角
谱线
极化(电化学)
分析化学(期刊)
分子物理学
物理
分子
物理化学
立体化学
量子力学
色谱法
有机化学
天文
作者
Mélanie Rosay,V. Weis,K.E. Kreischer,Richard J. Temkin,Robert G. Griffin
摘要
The sensitivity of solid-state NMR experiments can be enhanced with dynamic nuclear polarization (DNP), a technique that transfers the high Boltzmann polarization of unpaired electrons to nuclei. Signal enhancements of up to 23 have been obtained for magic angle spinning (MAS) experiments at 5 T and 85-90 K using a custom-designed high-power gyrotron. The extended stability of MAS/DNP experiments at low temperature is demonstrated with (1)H-driven (13)C spin-diffusion experiments on the amino acid proline. These (13)C-(13)C chemical shift correlation spectra are the first two-dimensional MAS/DNP experiments performed at high field (>1.4 T).
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