Rotational Energy Levels of a Linear Triatomic Molecule in a 2Π Electronic State

Abstract

Expressions are derived for the rotational energy levels of a linear triatomic molecule in a 2Π electronic state which take into account a spin orbit interaction and a vibronic Renner interaction. The results are valid when both interactions are small compared to the bending vibrational frequency. The similarities and differences between the expressions obtained and the corresponding expressions for diatomic molecules are discussed.