isoemissive point

https://doi.org/10.1351/goldbook.I03277
@W06659@, wavenumber or frequency at which the total intensity of emission of light by a sample does not change during a chemical reaction or physical change. The terms @IT07404@ and @I03314@ are sometimes used.
Note:
This term may be misleading because it does not specifically refer to light emission.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 358 [Terms] [Paper]