Transition between the ground state and a state in which a single
mode of vibration is multiply excited.
Note:
An overtone band results from an overtone transition.
Example:
Transition from the ground state to the state in which \(\nu_{i} \ge 2\), \(\nu_{j \neq i} = 0\).
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 759 (https://doi.org/10.1515/pac-2019-0203)