http://orgchem.colorado.edu/hndbksupport/nmrtheory/splitting.html 关於上次普化大家的疑问 为什麽同样population的Hydrogen, spin不同 NMR看不到 跟贝壳讨论的想法(其实都是他跟我讲的..XD)是觉得 同样population的Hydrogen spin不同的能阶是存在的 但是为什麽看不到 是因为这些能阶的跃迁是forbidden 详细的在上面Colorado Univ.的网站里 "Coupling is never observed between chemical shift equivalent nuclei, be it from symmetry or by accident, not because the Bn field disappears but because spin transitions that would reveal the coupling are forbidden by symmetry. The role of symmetry in forbidding spectral transitions is of general importance in spectroscopy but is beyond the scope of this discussion. " --

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