K. Al-ani
Jul 1, 1973
Citations
0
Influential Citations
2
Citations
Journal
Journal of Chemical Physics
Abstract
The photochemistry of the fluoro(trifluoromethyl)benzenes has been studied in the gas phase at wavelengths 248, 253.7, and 265 nm. Increase in the exciting wavelength caused an increase in fluorescence yields. At 265 nm the 1,4 isomer showed a yield of 0.23 compared to 0.35 and 0.32 for the 1,3 and 1,2 isomers, respectively. The mean radiative lifetime of the 1,4 isomer calculated from integrated absorption coefficients was found to be shorter than the mean radiative lifetimes for the 1,2 and 1,3 isomers. The sensitized phosphorescence of biacetyl and the Cundall methods were used to determine triplet‐state yields. For the 1,2 isomer the sensitized phosphorescence of biacetyl yields were found to be 0.41, 0.33, and 0.2 at 265, 253.7, and 248 nm, respectively, compared to 0.71, 0.56, and 0.41. for the 1,4 isomer and 0.67, 0.42, and 0.33 for the 1,3 isomer. Agreement was satisfactory between the two methods.