Abstract
Abstract Polarized T←S0 absorption spectra were measured for 2,3-dichloro-9,10-anthraquinone melt-grown single crystals in a magnetic field of 50 kOe. From the analysis of the Zeeman absorption patterns, the lowest triplet state of 2,3-dichloro-9,10-anthraquinone in the crystalline state has been assigned to 3A1(ππ*). The c-polarized first absorption peak at 21734.7 cm−1 has been interpreted as gaining intensity mainly from an x-polarized transition from the ground state to a B1(nπ*) perturbing singlet state, which is directly spin-orbit-coupled with the y spin-sublevel of the 3A1 state. The a- and b-polarized first peaks, at 21733.9 and 21733.6 cm−1, respectively, have been interpreted as gaining intensity through the configurational mixing of the 3A1(ππ*) state with a nearby 3B1(nπ*) state.
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