Abstract
An H 2 D 2 isotope effect on an external magnetic field effect on the hydrogen-oxygen reaction on an SnO 2 surface at 775 K was observed. The rate of increase for the external magnetic field effect on the H 2O 2 reaction was 1.5 times as large as on the D 2O 2 reaction. This effect strongly suggests that the H 2O 2 reaction on the SnO 2 surface is an Eley-Rideal type reaction. The present results strongly suggest that only the H 2O 2 reaction via the activated complex OH 2 − was accelerated by an external magnetic field and that the activated complex of this reaction has a structure in which there is only a weak interaction between undissociated hydrogen molecules and surface-adsorbed O 2−. A model is proposed in which the magnetic field affects the electron spin of the quasi-radical pair H · · H in activated complexes, and the recombination of H · · H is inhibited by the singlet-triplet conversion caused by applying an external magnetic field.
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