Measurements of the Zeeman effect in the A 2 Π and B 2 Σ + states of calcium fluoride

Abstract The magnetic tuning of the low rotational levels in the ( v  = 0) X 2 Σ + , ( v  = 0) A 2 Π, and ( v  = 0) B 2 Σ + electronic states of calcium monofluoride, CaF, have been experimentally investigated using high resolution optical Zeeman spectroscopy of a cold molecular beam. The observed Zeeman shifts and splittings are successfully modeled using a traditional effective Hamiltonian approach to account for the interaction between the ( v  = 0) A 2 Π and ( v  = 0) B 2 Σ + states. The determined magnetic g -factors for the X 2 Σ + , B 2 Σ + and A 2 Π states are compared to those predicted by perturbation theory.