| Abstract
| - The movement of the mercury electrode surface and the streaming of solution that accompany the currentoscillation in the redox reaction of the O2/O2- (superoxide ion) couple on a hanging mercury drop electrode(HMDE) have been investigated using a combined system of two laser interferometric techniques. That is,the simultaneous observation of both of these phenomena could be carried out. The movement of the mercuryelectrode surface during the oscillation was observed by the Michelson interferometric technique, and at thesame time, the streaming of solution around the electrode was done by the Mach−Zehnder interferometrictechnique. These observations confirm that the electrochemical oscillatory phenomena of the O2/O2- redoxcouple are caused by the streaming phenomena, that is, the movement of a mercury electrode surface andadjoining solution resulting from an inhomogeneous polarization of the electrode.
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