The emission spectra and decay kinetics after pulsed electron irradiation of 10-3 M adenine in an ethylene glycol:water (EGW) glass and of the solvent glass itself have been recorded at a temperature of 80°K under different gas pressures down to$10^{-6}\ \text{Torr}$. The effect of NaNO3 and${\rm NClO}_{4}$ at several different concentrations on the luminescence from glasses with and without adenine has been studied. It is found that NaNO3 at low concentration reduces the yield of solvent glass luminescence by an order of magnitude but has little effect on the adenine emission. High concentrations of both NaNO3 and${\rm NClO}_{4}$ are required to reduce the phosphorescence yield of adenine. It is concluded that the excited state responsible for the long-lived emission from the solvent is formed by a process involving "mobile" electrons, probably a charge recombination process, while the triplet state of adenine is populated either by direct excitation by slow electrons or by geminate ion pair recombination.

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