Abstract
Our approach for the derivation of the exact (non-relativistic) translational–rovibronic Hamiltonian, based on the Hamiltonian operator in tensor form, is now extended to cases in which a body-fixed frame is defined via the introduction of two Euler angles (two-rotational-angle embedding). Diatomic molecules and diatom–diatom systems are considered as examples for this general formulation. For comparison, the three-rotational-angle embedding version of the diatom–diatom Hamiltonian is also derived.
Acknowledgement
We are extremely grateful to professor B. T. Sutcliffe for reading the manuscript and giving many helpful suggestions prior to submission.