On the Zeeman effect in electronic transitions of diatomic molecules

The Zeeman effect for diatomic molecules is calculated in a representation with Hund's case (a) wave functions as a basis set. The resulting expressions are simpler and easier to handle than those obtained from previous calculations on the basis of cace (b) wave functions. The calculations of intensities and polarization of Zeeman patterns is presented for transitions between doublet states with arbitrary spin-orbit (if Λ≠ 0) or spin-rotation (if Λ = 0) interaction, and for case (a)-case (a) transitions of any multiplicity. These calculations are in good agreement with observations.