A laser flash photolysis study of the effects of ultrahigh magnetic fields up to 29.6T on dynamic behaviour of radical pairs in micellar solutions

The photoreduction of benzophenone in micellar SDS and Brij 35 solutions was investigated at room temperature under magnetic fields of 0–29.6T. In the SDS solution, the radical-pair lifetime increased with increasing field from 0T (0.4 μs) to 3.36T (1.6 μs), but the lifetime attained a constant value with increasing field from 3.36 and 29.6T. In the Brij 35 solution, the lifetime increased with increasing field from 0T (0.7 μs) to 3.36–6.30T (about 3 μs) and decreased with increasing field from 6.30 to 29.6T (2.1 μs), approaching a saturated value at 29.6T. These magnetic field dependences could be explained by the previous predictions derived from the relaxation mechanism.