Okay, I'm havin trouble understanding the difference between NMR and spectrums. As far as I know: in NMR you excite a nuclei from one state to another. The frequency of the energy absorbed is what we measure. How is that related to normal spectrums and colour? For example, absorption of radiation corresponding to the visible region causes transitions of electrons between energy leves within the molecule. (difference in energy given by Planck's equation). Hence you get a spectrum But how is this different to what we do in NMR? Is itbecause in NMR its at the nuclei level and the other at a molecular level? Thank you!