A nuclear magnetic resonance (NMR) spectrum results from the emission of photons when nuclear spin alignment is flipped.

Question

Quizplus · Accepted Answer

In NMR spectroscopy, the energy difference between nuclear spin states in a magnetic field is exploited. When nuclei (such as $^1H$ or $^{13}C$) in a sample are exposed to a radiofrequency pulse, their spin states can flip from a lower to a higher energy state. Upon returning to their lower energy state, they emit photons, and this emission is detected and translated into an NMR spectrum.

A Nuclear Magnetic Resonance (NMR) Spectrum Results from the Emission