Higher-dimensional Methods
3D and 4D experiments can also be done, sometimes by running the pulse sequences from two or three 2D experiments in series. Many of the commonly-used 3D experiments however are triple resonance experiments, examples include the HNCA and HNCOCA experiments, which are often used in protein NMR.
Read more about this topic: Two-dimensional Nuclear Magnetic Resonance Spectroscopy
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—Henry David Thoreau (1817–1862)