Abstract
The photoconductivity due to radiation-produced trapped electrons in glassy alkaline ice (10M NaOH) at 77°K has been studied. The temperature dependence of the photocurrent from 4 to 120°K and the coincidence of the wavelength dependence of the photocurrent with the absorption band show that no stable bound excited state exists for the trapped electron. The relation of this result to the importance of short-range interactions in electron binding is discussed. It is also found that radiation-produced shallow traps for electrons are formed. These traps have an average depth of 0.048 eV and appear to be associated with a lattice distortion created by the presence of O−. Both Ohmic and super-Ohmic currents are found under certain conditions. The super-Ohmic current is interpreted as due to a voltage-dependent lifetime of conduction band electrons.
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