Electronic transition between an excited state and a state in which all vibrational quantum numbers are the same or greater.
Notes: - A hot band arises from a hot transition.
- A hot transition has the same changes in vibrational quantum numbers as a fundamental, overtone transition, or sum transition but it originates in an excited vibrational state not the ground state.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 749 (https://doi.org/10.1515/pac-2019-0203)