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Evidence for Quantum Beats generated by a photo-induced charge transfer reaction

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Abstract

Photo-initiated charge transfer reactions in solution proceed via a radical pair intermediate which in most cases will separate on a time scale of several nanoseconds. The non-adiabicity of this process is the source of coherences in the spin system. A quantitative discussion of the observability of the resulting quantum beats using Fourier-transform EPR is presented. We also show experimental evidence for the predicted quantum beats using the photo-initiated charge transfer reaction of Zn-Tetraphenylporphyrin and benzoquinone in 2-propanol. The analysis of the beat frequency leads to an estimate of the exchamge couplingJ≈2.6·106 s−1 of the Coulomb-coupled radical pair.

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Authors and Affiliations

  1. Institut für Physik, Universität Dortmund, Otto-Hahn-Strasse, D-4600, Dortmund 50, Germany

    G. Kroll, M. Plüschau & K. -P. Dinse

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  1. G. Kroll
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  2. M. Plüschau
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  3. K. -P. Dinse
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Kroll, G., Plüschau, M. & Dinse, K.P. Evidence for Quantum Beats generated by a photo-induced charge transfer reaction. Appl. Magn. Reson. 3, 171–183 (1992). https://doi.org/10.1007/BF03166788

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  • DOI: https://doi.org/10.1007/BF03166788

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