Another type of it generates three closely spaced doublets and is known as the Paschen-Back effect.
Quadratic consequences of this effect can be measured by the Briet-Rabi formula, and in astronomy, it can be replaced by the Hanle effect. It can be studied with a Fabry-Perot interferometer, and one type of it occurs when the total spin of the initial or final state is nonzero, which is known as the anomalous version. Another type of it generates three closely spaced doublets and is known as the Paschen-Back effect. For 10 points, name this effect in which the spectral lines of an atom are split when placed in an external magnetic field, the analogue of the Stark effect.
Quadratic consequences of this effect can be measured by the Briet-Rabi formula, and in astronomy, it can be replaced by the Hanle effect.
{Zeeman} effect