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首页> 外文期刊>Applied Magnetic Resonance >Study of diamond film by dynamic nuclear polarization-enhanced C-13 nuclear magnetic resonance spectroscopy
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Study of diamond film by dynamic nuclear polarization-enhanced C-13 nuclear magnetic resonance spectroscopy

机译：利用动态核极化增强C-13核磁共振波谱研究金刚石膜

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摘要

Three chemical vapor deposited diamond films were studied by dynamic nuclear polarization (DNP)-enhanced high-resolution solid-state C-13 nuclear magnetic resonance (NMR) spectroscopy. Enhanced C-13 direct-poiarization spectra of diamond Films were obtained by irradiating the samples with microwaves at or near electron spin resonance Larmor frequency of carbon center free radicals. No NMR signal for sp(2) hybridized carbons could be observed. From the Curve of the DNP enhancement as a function of Frequency, it is found that the dominant DNP mechanism is the solid-state effect. The C-13 cross-polarization spectrum, which is an evidence for existence of the proton defect in the lattice of diamond films, is much broader than the C-13 single Pulse spectrum. The reason is discussed shortly.
机译：通过动态核极化（DNP）增强的高分辨率固态C-13核磁共振波谱研究了三种化学气相沉积的金刚石膜。通过用碳中心自由基的电子自旋共振或拉莫尔频率附近的微波辐照样品，可获得金刚石薄膜的增强的C-13直接极化作用光谱。没有观察到sp（2）杂化碳的NMR信号。从DNP增强曲线作为频率的函数可以发现，主要的DNP机制是固态效应。 C-13交叉极化谱比C-13单脉冲谱宽得多，这表明金刚石膜晶格中存在质子缺陷。原因将在稍后讨论。

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