Publikation: Time-resolved investigation of singlet radical pair recombination in water-in-oil microemulsions : magnetic field effects in two time domains
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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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BAUMANN, 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)80314-7BibTex
@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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