Carbon-13 NMR

NMR observation of spin-$\frac{1}{2}$ carbon-13 nuclei. Routine spectra often use proton decoupling, but this does not automatically decouple other spin-active nuclei.

An NMR multiplicity-editing experiment in which carbon signals are separated by the parity of their attached proton count: CH and CH3 have one relative phase, while CH2 and nonprotonated carbons have the other. The absolute up/down convention depends on processing and is not a universal assignment.