Abstract
Magnetic-field-dependent yields in many chemical reactions1–13 have been interpreted by the so-called ‘radical pair’ model14–16. To establish the mechanism of this dependence, we have measured the product yield of a magnetic-field-dependent photochemical reaction under a magnetic field by spin-trapping a radical intermediate and using electron spin resonance (ESR). On irradiating with microwave and ultraviolet light simultaneously under various magnetic fields, the ESR spectra of the free radicals composing the radical pair can be traced by measuring the spin-adduct yield. This observation, which we term ‘product-yield-detected ESR’, provides direct evidence that radical-pair interaction modifies the reaction yield. This is the first experiment which has demonstrated that an ESR transition can modify the product yield.
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Okazaki, M., Shiga, T. Product yield of magnetic-field-dependent photochemical reaction modulated by electron spin resonance. Nature 323, 240–243 (1986). https://doi.org/10.1038/323240a0
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DOI: https://doi.org/10.1038/323240a0
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