Magnetic field effects on the chemical reactions under ultrahigh fields of up to 50 T

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An water-cooled pulsed magnet which had a room temperature bore with a diameter of 20 mm was newly constructed. Magnetic field effects on a triplet sensitization reaction of p-aminophenyl disulfide (APDS) with xanthone (Xn) were studied in a sodium dodecylsulfate (SDS) micellar solution by a nanosecond laser flash photolysis technique under ultrahigh magnetic fields of up to 28 T. Upon irradiation of the SDS micellar solution containing APDS and Xn, triplet radical pairs of p-aminophenylthiyl radicals were generated. The yield of the escaped p-aminophenylthiyl radical was found to decrease by 6±2 % at 28 T compared with that at 0 T. The observed MFEs can be qualitatively explained by the RM together with slow spin conversion at 0 T. The spin relaxation rates were calculated using adequate parameter set. The magnetic field dependence of the calculated relaxation rate can reproduce the observed MFEs on the yield of escaped p-aminophenylthiyl radical.