## , $$Z_{50}$$

of a photochromic system
https://doi.org/10.1351/goldbook.ZT07501
Number of cycles required to reduce by 50% the initial @A00028@ of the coloured form of a photochromic compound at a specific @W06659@.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 441 [Terms] [Paper]