Abstract
Excitation wavelength dependence ( λ ex = 220–290 nm) of photoionization quantum yields ( Φ ion) of indole and tryptophan in water were directly obtained through nanosecond time-resolved transient absorption measurements. Monophotonic photoionization occurred efficiently in this wavelength range. We conclude that photoionization proceeds through electron transfer from the neutral excited state to water by comparing the Φ ion versus λ ex dependences with the ground-state spectra. Mechanism of the electron transfer process is discussed.
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Schedule a callMore From: Journal of Photochemistry & Photobiology, A: Chemistry
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