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Summary of Research Projects (Supports in 2003
Fiscal Year)
| Subjects |
Magnetic Field Effect on the Picosecond Dynamics of Chemical Reaction under Ultrahigh Magnetic Field |
| Representative researcher |
Saitama University Masanobu WAKASA |
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We constructed a water-cooled pulsed magnet which had a small room temperature bore (20 mm). The maximum field and repetition rate were 32.5 T and 1 shot / 3 min, respectively. With this pulsed magnet, we made ns-laser flash photolysis apparatus with a double-beamed probe light system. We could realize precise measurements of magnetic field effects (MFEs) on photochemical reactions in solutions together with the system and signal accumulation. We have been studying the effects of ultrahigh magnetic fields (0-30 T) on photodecomposition reaction of p-aminophenyl disulfide by triplet sensitization in a micellar solution of sodium dodecyl sulfate at 288 K. In this reaction, a radical pair consisting of two equivalent (p-aminophenyl)thiyl radicals was generated. The yield of the escaped (p-aminophenyl)thiyl radical increased steeply with increasing magnetic field strength (B) from 0 to 1 T, but decreased gradually from 1 to 10 T. At 10 T, the yield of the escaped radical became similar to that at 0 T. With increasing B from 10 T to 30 T, the yield still decreased. Such inversion of MFEs was observed for the first time and could not be explained by the ordinary relaxation mechanism of the MFEs. |
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