half-life, \(T_{1/2}\)

of a photochromic system
https://doi.org/10.1351/goldbook.HT07390
Time necessary for thermal bleaching to half of the @A00028@ of the coloured form of a @P04589@ compound at a specific @W06659@ during one cycle.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 349 [Terms] [Paper]