题目内容
核磁共振谱法与红外吸收光谱法一样，都是基于吸收电磁辐射的分析法。
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通过自旋驰豫，可以维持高能态核的微弱多数。
HSQC detects correlations of two nuclei separated by one bond, while HMBC detects correlations of two nuclei over longer ranges of about 2-4 bonds.
Both 13C-1H HSQC and HMBC are heteronuclear correlation spectroscopy between proton and carbon
COSY determines signals arising from protons that are close to each other in space even if they are not bonded.
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