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Radical generation and ESR analysis at 77 K (A) Radical concentration in pure PA as a function of UV irradiation time as determined by X-band ESR. (Inset) Structural formula of [1-13C]PA. (B) X-band ESR spectrum of natural abundance PA after 60 min of UV irradiation. (C) X-band ESR spectrum of [1-13C]PA after 60 min of UV irradiation.
