Abstract
It is shown that during electron irradiation of KBr and KI crystals at 80 K a vibronic structure develops in the emission spectrum characteristic of O - 2 molecular ions. The origin of these ions is explained in terms of the processes following the radiolysis of OH - impurity ions. Total disappearance (thermal quenching) of the vibronic structure T#62;170 K for KBr and T#62;110 K for KI is attributed to the reaction between mobile X - 2 (V k) centres and O - 2 molecular ions resulting in the formation of optically inactive O 2 molecules.
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