Excited Singlet Absorption in 1,2-Benzanthracene by the Use of Nanosecond Laser Photolysis and Spectroscopy

Using the technique of laser photolysis and spectroscopy, we have observed excited singlet state absorption bands in 1,2-benzanthracene at 560 and 520 nanometers. The bands decay in less than 50 nanoseconds and are replaced by the known absorption spectrum of the lowest triplet state.