统计自旋极化之间的力探测核双共振
Force-detected nuclear double resonance between statistical spin polarizations
摘要：
我们证明了纳米尺度体积的自旋随机波动，而不是玻尔兹曼极化占主导地位的核双共振。在交叉极化实验中，当满足哈特曼-哈恩条件时，两种自旋之间会发生触发器，它们的波动会耦合。我们使用磁共振力显微镜来测量1H和13 C自旋之间的这种影响，在13 C富集硬脂酸。交叉极化技术的发展统计合奏增加了一个重要的工具，在纳米尺度的磁共振产生化学对比。
英文摘要：
We demonstrate nuclear double resonance for nanometer-scale volumes of spins where random fluctuations rather than Boltzmann polarization dominate. When the Hartmann-Hahn condition is met in a cross-polarization experiment, flip-flops occur between two species of spins and their fluctuations become coupled. We use magnetic resonance force microscopy to measure this effect between 1H and 13C spins in 13C-enriched stearic acid. The development of a cross-polarization technique for statistical ensembles adds an important tool for generating chemical contrast in nanometer-scale magnetic resonance.
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