Abstract
The spin lattice relaxation in the excited triplet state of quinoxaline molecules in a perdeutero-naphthalene host crystal was investigated at high magnetic field ( B = 5 T) between T = 1.7 K and T = 4.2 K. Relaxation rates were deduced from the non-monoexponential phosphorescence decay of the individual Zeeman sublevels. Besides the so far investigated Δ m = 1 transition the Δ m = 2 transition was observed and attributed to a purely direct process. Its anisotropy is different to that of the Δ m = 1 direct process at 1.7 K. The temperature effect upon Δ m = 1 relaxation anisotropy is discussed.
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