Atomic, Molecular and Optical Physics | Physical Chemistry
An old drawing, which had an error in it, is re-presented (corrected) for understanding the relationships in diatomic vibrational-rotational interactions at the introductory level.
David, Carl W., "Infra-Red Microwave Spectra, Overtones, Degeneracy and Thermal Populations all in one diagram" (2018). Chemistry Education Materials. 100.