Factor Group Splitting and Zeeman Splitting of the Lowest Triplet State of Phenazine

The T1←S0 transition of the phenazine crystal is studied in polarized light, and in high magnetic fields, with the crystals at 4.2°K. A factor group splitting of 4 cm−1 is observed in the 0, 0 band. The two components have the same polarization—predominantly along the b axis. The polarization, relative intensity, and Zeeman spectra are used to assign the plus and minus factor group states in association with a crystal symmetry adapted spin—orbital coupling theory. The lowest triplet state is assigned as 3B2u in agreement with theoretical predictions.