https://doi.org/10.1351/goldbook.I03102
A photophysical process. An isoenenergetic @[email protected] between two electronic states of the same multiplicity. When the transition results in a vibrationally excited molecular entity in the lower @[email protected], this usually undergoes @[email protected] to its lowest vibrational level, provided the final state is not @[email protected] to @[email protected]