I am just starting quantum mechanics and I am having so many problems now. Can anyone please explain what Electron Spin Resonance mean? Thank you in advanced!

Question

anonymous · Answer

When the molecules of a solid exhibit paramagnetism as a result of unpaired electron spins, transitions can be induced between spin states by applying a magnetic field and then supplying electromagnetic energy, usually in the microwave range of frequencies. The resulting absorption spectra are described as electron spin resonance (ESR) or electron paramagnetic resonance (EPR).