Abstract
A study has been made of the potential changes observed when a flowing mercury pool electrode is irradiated with light from a Q-switched ruby laser. The results obtained with solutions containing NO 3 − or N 2 O suggest that effects observed with HCl solution when the electrode is negatively charged are unlikely to be due to biphotonic emission of free electrons, although the potential variation of the coulostatic photopotential and the dependence of the latter on light dose do superficially point to such an emission. It is suggested that the photopotential may involve the heterogeneous reaction of “hot” electrons with solvent molecules if it is not a thermal artefact.
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