Nl. Lavrik et al., MAGNETIC-FIELD EFFECT IN THE GEMINATE RECOMBINATION OF RADICAL-ION PAIRS - POSSIBLE PITFALLS IN MICROSECOND MEASUREMENTS OF TRIPLET REACTION-PRODUCTS, The Journal of chemical physics, 99(11), 1993, pp. 9304-9306
In the geminate recombination reaction of radical ion pairs with overa
ll triplet multiplicity, locally excited triplet molecules are generat
ed. The magnetic field effect (of the hyperfine type) on the triplet y
ield is usually determined by measuring the triplet absorbance both at
zero and at higher applied magnetic fields. It is shown that the magn
itude of this magnetic field effect decreases with time if the decay o
f the triplet concentration measured in the microsecond range is not o
f first order. This has been demonstrated experimentally using the lin
ked acceptor-donor compound pyrene-(CH2)16-DMA as the test molecule in
acetonitrile.