Optical and Thermal Bleaching of Trapped Electrons in Aliphatic Amine Glasses

Abstract

An optical bleaching study has been made of trapped electrons in y-irradiated aliphatic amines at -196 "C. The results indicate that the optical absorption of the trapped electrons in the amines is attributed to optical transitions to both bound excited states and a continuum state. The thermal decay of the trapped electrons has been studied by the e.s.r. technique at temperatures above -196 "C. It has been found that the line width of the e.s.r. spectra of the trapped electrons in some of the amines changes on warming. IntroductionIn the previous communication (1) we have reported optical and e.s.r. observations on trapped electrons produced in y-irradiated aliphatic amine glasses at -196 "C, giving the optical and e.s.r. parameters as well as yields of the trapped electrons.In this work, we have made an optical bleaching study of the trapped electrons in aliphatic amine glasses at -196 "C to get a better understanding of the nature of the excited states to which optical transitions occur. Using the e.s.r. technique we have also made a thermal bleaching study of the trapped electrons at temperatures above -196 "C to demonstrate the temperature at which the trapped electrons decay rapidly in these matrices and to obtain some information about the effect of matrix relaxation on the e.s.r. spectra of the trapped electrons.

Electronic spectra of trapped electrons in organic glasses at 4.deg.K. V. Aliphatic amines

“…Recently we have made a photobleaching study of trapped electrons in the amine glasses at 77°K. 6 In this work we have measured the optical absorption spectra of trapped electrons in several amine glasses at 4°K and those at 77°K which have not been reported. We also include in this paper the optical absorption parameters obtained in this work which are more accurate than those reported in a previous paper.5 Based on these results we discuss the optical absorption characteristics, the relaxation of electron traps, and the relative efficiency of electron trapping at 4 and 77°K.…”

Effect of Dose on the Yield of Trapped Electrons in Aliphatic Amine Glasses

“…and optical absorption characteristics of trapped electrons produced in y-irradiated aliphatic amine glasses at 77 OK, demonstrating that there is a correlation between such spectroscopic characteristics and matrix polarity. Recently we have also made an optical bleaching study of trapped electrons in the same amine glasses (2), showing that there are bound excited states for trapped electrons in these matrices.…”