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Photon-echo experiments on singlet-triplet transitions in organic mixed crystals

MPS-Authors
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Zimmermann,  Herbert
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;
Zimmermann Group, Max Planck Institute for Medical Research, Max Planck Society;
Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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https://www.sciencedirect.com/science/article/pii/0009261484801578/pdf?md5=70301464d9be7226e2c7f6cd73e45c6d&pid=1-s2.0-0009261484801578-main.pdf
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https://doi.org/10.1016/0009-2614(84)80157-8
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Citation

Wäckerle, G., Zimmermann, H., & Dinse, K. (1984). Photon-echo experiments on singlet-triplet transitions in organic mixed crystals. Chemical Physics Letters, 110(2), 107-111. doi:10.1016/0009-2614(84)80157-8.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-AF8E-9
Abstract
The homogeneous optical linewidth of a spin-forbidden So → T1 transition in a chemically mixed organic crystal was directly measured in a two-pulse photon-echo experiment. The experimental values of T2Opt for the system dibromobenzophenone in dibromodiphenyl ether ranged from 1.4(3) to 3.8(2) μs, depending on the nuclear spins of the host. A temperature-dependent contribution to (T2Opt)−1 revealed an activation energy ΔE of 13.8(5) cm−1, which is tentatively attributed to a librational mode frequency.