Abstract
A spectroscopic perturbation is a local disruption of the expected “textbook” pattern of energy levels and transition intensities. It results when degeneracy accidentally occurs between two or more “pure” same-J, same-parity states, which are capable of interacting with each other via some usually harmless term in the effective Hamiltonian. Perturbations between same-\(\Omega \) states are called homogeneous (because the interaction matrix element is independent of J) and those where \(\Delta \Omega = 1\) are called heterogeneous (because the interaction matrix element is proportional to J) [1, 2].
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Field, R.W. (2015). Spectroscopic Perturbations: Homogeneous and Heterogeneous. In: Spectra and Dynamics of Small Molecules. Lecture Notes in Physics, vol 900. Springer, Cham. https://doi.org/10.1007/978-3-319-15958-4_3
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DOI: https://doi.org/10.1007/978-3-319-15958-4_3
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