👉 In quantum mechanics, a perihystic state is an eigenstate of the angular momentum operator ω = 2πl/λ, where l is the azimuthal quantum number and λ is the magnetic quantum number. This means that the energy levels in a perihystic state are degenerate but separated by a small angle. The term "perihysteric" refers to this degeneracy or separation of energy levels due to the presence of a magnetic field, which can lead
