The Recombination Luminescence of Tryptophan in Aqueous Glasses, I. Quenching Effect of Electron Scavengers

Abstract

The quenching effect of SeO4-- and NO3- (scavenger for trapped electrons) on the delayed luminescence (‘recombination luminescence’) caused by the recombination of trapped electrons with mother tryptophan cations was investigated in aqueous 9 M NaOH and 9.5 M LiCl glasses at 77 K. The results show that the trapped electrons responsible for the recombination fluorescence were deep-trapped ones in 9 M NaOH glasses and shallowand deep-trapped ones in 9.5 M LiCl glasses. However, trapped electrons participating in the recombination phosphorescence were almost shallow-trapped ones in the two glasses. The distribution of the trapped electrons is discussed.