The photoionization of tryptophan has been studied by ESR spectroscopy using the free radical scavenger 5, 5 dimethyl‐1‐pyrroline‐l‐oxide as a spin trap for hydrated electrons. A special set‐up has been devised to irradiate more than one aliquot of the bubbled aqueous solutions in the cavity without removing the ESR cell out of the cavity. Quantum yields of electrons production have been estimated as a function of irradiation wavelength. No photoionization threshold has been observed in these experiments.
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Hoebeke et al. (1986) studied this question.
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