Scavenging Kinetics of Electrons Produced by Irradiation of Organic Glasses; Experimental Evidence for Long Range Tunneling

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Abstract
This paper reports new experimental results on the influence of scavengers on the yields of trapped electrons in γ‐irradiated organic glasses, which show that: (1) Trapped electron yields observed minutes after irradiation decrease exponentially with scavenger concentration; (2) transfer of trapped electrons to scavengers continues after irradiation, even in rigid matrices where no trapped electron decay occurs in the absence of scavengers; (3) the presence of a scavenger of low electron affinity can increase the yield of the anion of a scavenger of high electron affinity, although a large decrease would be expected if the scavengers competed for mobile electrons; (4) the ``electron capture cross sections'' of scavengers are often strongly dependent on what species the scavengers compete with for electrons, apparently indicating that the ``electron capture cross section'' is not an appropriate concept. These results and several others are consistent with a model involving tunneling of trapped electrons, but seem to be inconsistent with any model based on capture of electrons prior to their localization in traps.

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