Rotational intensities in doublet transitions of a diatomic molecule

Abstract

Rigorous expressions for the rotational term values and eigenfunctions of a diatomic molecule in doublet electronic state are rederived, taking due account of the effect of centrifugal distortion on the spin multiplets. The eigenfunctions are used to obtain expressions for the rotational line strengths appropriate for ²Σ -²Π (int) transition. The possibility of determining from intensity measurements, the spin-rotation parameter γ independent of A_D, the centrifugal distortion parameter of the spin-orbit coupling constant A, is pointed out.