internal transmittance symbols: Ti, τi

Synonym: internal transmission
https://doi.org/10.1351/goldbook.08262
Transmittance fully corrected for surface effects and effects of the cell, such as reflection, scattering, luminescence, and vignetting losses.
Note:
If scattering and luminescence in the sample are negligible, αi+Τi=1, where αi is internal absorptance.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 664 [Terms] [Paper]