Mixed Magnetic and Electric Dipole Transition in s-Triazine

We have shown that the radiation pattern for absorption to the lowest energy excited singlet state of s-triazine corresponds to that of a mixed electric and magnetic dipole transition. This was done by demonstrating, for the first time with an organic, the classic procedure of obtaining absorption coefficients for different k, ε̂, and Ĥ for a uniaxial arrangement of molecules. We find the 30 014 cm−1 transition of s-triazine to be 26% magnetic and 74% electric dipole, hence the state symmetry is 1E in the crystal field, and 1E″ in the free molecule (D3h).