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Light Modulated Cidep Experiments

  • Conference paper
Chemically Induced Magnetic Polarization

Part of the book series: Nato Advanced Study Institutes Series ((ASIC,volume 34))

Abstract

The theoretical background for these experiments is developed in terms of the general theory proposed by Pedersen and Freed. The experiments are performed either in the time domain or in the frequency domain with high intensity light sources. Of crucial importance is the generation of intense light pulses of a shape conducive to quantitative interpretation of the experimental data. The ESR spectrometer is operated at constant magnetic field and with a response time much larger than the radical spin-lattice relaxation time. Time-averaging is necessary for experiments in the time domain. The experiments have demonstrated the existence of both a triplet mechanism (TM) and a radical pair mechanism (RPM) for generation of polarization. Data from recent experiments in the time domain and in the frequency domain are in good agreement with the microscopic theory.

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This work was supported in part by a NATO Research Grant.

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References

  1. J.B. Pedersen and J.H. Freed, J. Chem. Phys. 58, 2746 (1973).

    Article  Google Scholar 

  2. J.B. Pedersen and J.H. Freed, J. Chem. Phys. 59, 2869 (1973).

    Article  CAS  Google Scholar 

  3. J.B. Pedersen, J. Chem. Phys. 59, 2656 (1973).

    Article  CAS  Google Scholar 

  4. J.B. Pedersen, C.E.M. Hansen, H. Parbo, and L.T. Muus, J. Chem. Phys. 63, 2398 (1975).

    Article  CAS  Google Scholar 

  5. H. Paul, Chem. Phys. 15, 115 (1976).

    Article  CAS  Google Scholar 

  6. H. Schuh, E.J. Hamilton, H. Paul, and H. Fischer, Helv. Chim. Acta, 57, 2011 (1974).

    Article  CAS  Google Scholar 

  7. R. Livingston and H. Zeldes, J. Mag. Res. 9, 331 (1973).

    CAS  Google Scholar 

  8. R. Livingston and H. Zeldes, J. Chem. Phys. 54, 4891 (1973).

    Article  Google Scholar 

  9. K.Y. Choo and J.K.S. Wan, J. Am. Chem. Soc. 97, 7127 (1975).

    Article  CAS  Google Scholar 

  10. H. Levanon and S.I. Weissman, J. Am. Chem. Soc. 93, 4309 (1971).

    Article  Google Scholar 

  11. L.T. Muus, S. Frydkjaer, and K. Bondrup Nielsen, (to be published).

    Google Scholar 

  12. E.J. Hamilton and H. Fischer, J. Phys. Chem. 77, 722 (1973).

    Article  CAS  Google Scholar 

  13. P.B. Ayscough, T.H. English, and D.A. Tong, J. Phys. E. 9, 31 (1976).

    Article  CAS  Google Scholar 

  14. P.B. Ayscough, G. Lambert, and A.J. Elliot, J.C.S. Faraday I, 72, 1770 (1976).

    Article  CAS  Google Scholar 

  15. P.W. Atkins, K.A. McLauchlan, and A.F. Simpson, J. Phys. E. 3, 547 (1970).

    Article  CAS  Google Scholar 

  16. P.W. Atkins, K.A. McLauchlan, and P.W. Percival, Mol. Phys. 25, 281 (1973).

    Article  CAS  Google Scholar 

  17. H.M. Vyas, S.K. Wong, B.B. Adeleke, and J.K.S. Wan, J. Am. Chem. Soc. 97, 1385 (1975).

    Article  CAS  Google Scholar 

  18. B.B. Adeleke and J.K.S. Wan, J.C.S. Faraday I, 72, 1799 (1976).

    Article  CAS  Google Scholar 

  19. S.K. Wong and J.K.S. Wan, J. Am. Chem. Soc. 94, 7197 (1972).

    Article  CAS  Google Scholar 

  20. S.K. Wong, W. Sytnyk, and J.K.S. Wan, Can. J. Chem. 50, 3052 (1972).

    Article  CAS  Google Scholar 

  21. S.K. Wong, D.A. Hutchison, and J.K.S. Wan, Can. J. Chem. 52, 251 (1974).

    Article  CAS  Google Scholar 

  22. The polarization ratio P in Ref. 17 is equal to-V(I)(1+V(R))-1 in our notation. This identification is approximate only since no allowance is made for spectrometer response.

    Google Scholar 

  23. If we make the identification in Ref. 22 and further assume that-V2(R) = V2, (R) where -2 and +2 are corresponding low and high-field fines we can calculate the following values for the 1, 4-naphthosemiquinone radical in Ref. 17, Table I:.

    Google Scholar 

  24. R. Livingston and H. Zeldes, J. Chem. Phys. 44., 1245 (1966).

    Article  CAS  Google Scholar 

  25. P.W. Atkins and G.T. Evans, Mol. Phys. 27, 1633 (1974).

    Article  CAS  Google Scholar 

  26. J. Boiden Pedersen and J.H. Freed, J. Chem. Phys. 62, 1706 (1975).

    Article  CAS  Google Scholar 

  27. Calculated from Eq. (34) in Ref. 25.

    Google Scholar 

  28. D.R. Kemp and G. Porter, Proc. Roy. Soc. (London) A 326, 117 (1971).

    Article  CAS  Google Scholar 

  29. N.C. Verma and R.W. Fessenden, J. Chem. Phys. 58, 2501 (1973).

    Article  CAS  Google Scholar 

  30. P.B. Ayscough, T.H. English, G. Lambert, and A.J. Elliot, Chem. Phys. Lett. 34, 557 (1975).

    Article  CAS  Google Scholar 

  31. H. Veenvliet and D.A. Wiersma, J. Chem. Phys. 60, 704 (1974).

    Article  CAS  Google Scholar 

  32. A.I. Attia, B.H. Loo, and A.H. Francis, Chem. Phys. Lett. 22., 537 (1973).

    CAS  Google Scholar 

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© 1977 D. Reidel Publishing Company, Dordrecht, Holland

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Muus, L.T. (1977). Light Modulated Cidep Experiments. In: Muus, L.T., Atkins, P.W., McLauchlan, K.A., Pedersen, J.B. (eds) Chemically Induced Magnetic Polarization. Nato Advanced Study Institutes Series, vol 34. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-1265-2_12

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  • DOI: https://doi.org/10.1007/978-94-010-1265-2_12

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-1267-6

  • Online ISBN: 978-94-010-1265-2

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