For 10 points, name this effect, which occurs due to the splitting of energy levels and associated spectral lines by an external magnetic field.
Atomic absorption spectroscopy uses this effect to correct background, and in EPR this effect creates a gap in the energies of a paramagnetic center, which is then matched by a microwave emission. The alpha and pi lines that this effect produces absorb plane polarized radiation in perpendicular directions and the anomalous form of this effect prompted Land?and Heisenberg to introduce half integer quantum numbers. Also used to explain the Lyman-alpha transition in hydrogen, it can be reversed when sufficiently large field strengths disrupt the coupling between orbital and spin angular momenta in the Paschen-Back effect. For 10 points, name this effect, which occurs due to the splitting of energy levels and associated spectral lines by an external magnetic field.
Atomic absorption spectroscopy uses this effect to correct background, and in EPR this effect creates a gap in the energies of a paramagnetic center, which is then matched by a microwave emission.
Zeeman effect