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Unpaired electrons in 365 nm irradiated fibrous proteins.

By examining the temperature dependence of the electron spin resonance signals produced in wool, silk, and mohair by 365 nm radiation evidence has been obtained which suggests that free radical pairs or biradicals may be responsible for the resonance. The nature of the esr spectra and the lack of measurable photoconductivity weigh heavily against the assignment of the signal to electrons in conduction bands which until recently seemed a plausible explanation.