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Time-resolved investigation of singlet radical pair recombination in water-in-oil microemulsions : magnetic field effects in two time domains

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1987

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Baumann, Dietrich
Ulrich, Thomas

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Chemical Physics Letters. 1987, 137(2), pp. 113-120. ISSN 0009-2614. Available under: doi: 10.1016/0009-2614(87)80314-7

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Geminate recombination of singlet radical pairs has been studied by nanosecond laser flash spectroscopy in nanometer-sized water droplets of AOT/H2O/isooctane W/O microemulsions. The radical pairs were produced by electron-transfer quenching of singlet excited oxonine by N,N,N',N'-tetramethylparaphenylenediamine. Weak magnetic fields (BImage = 7.5 mT) decrease the yield of radicals appearing directly after the laser flash. In stronger fields an increase in the rate of time-resolved recombination from k rec = 1.1 × 10 6 s−1 at zero field to krec = 1.8 × 10 6 s−1 at 1 T is observed. Onset of the latter effect occurs at about 50 mT. The dual magnetic field effect is discussed in terms of the CIDNP-type radical pair mechanism and the radical pair relaxation mechanism.

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540 Chemie

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ISO 690BAUMANN, Dietrich, Thomas ULRICH, Ulrich STEINER, 1987. Time-resolved investigation of singlet radical pair recombination in water-in-oil microemulsions : magnetic field effects in two time domains. In: Chemical Physics Letters. 1987, 137(2), pp. 113-120. ISSN 0009-2614. Available under: doi: 10.1016/0009-2614(87)80314-7
BibTex
@article{Baumann1987Timer-9564,
  year={1987},
  doi={10.1016/0009-2614(87)80314-7},
  title={Time-resolved investigation of singlet radical pair recombination in water-in-oil microemulsions : magnetic field effects in two time domains},
  number={2},
  volume={137},
  issn={0009-2614},
  journal={Chemical Physics Letters},
  pages={113--120},
  author={Baumann, Dietrich and Ulrich, Thomas and Steiner, Ulrich}
}
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