Abstract
If ultrasonic waves are propagated through an electrolytic solution, alternating potentials are produced within the solution as a result of the dynamical reaction of the ions to the material waves. Apparatus has been developed for the measurement of these ionic vibration potentials with pulse-modulated ultrasonic waves at frequencies from 200 to 1000 kc/sec. Preliminary measurements indicate that the amplitude of the alternating potentials is a function of the nature of the electrolyte but is essentially independent of the concentration for dilute solutions as is predicted by theory. A value of 5 microvolts per unit velocity amplitude has been found for 0.005 molar potassium chloride solution at 200 kc/sec. These results are in general agreement with the semiquantitative, relative measurements obtained with a standing wave technique during the first experimental confirmation of the effect. Ionic vibration potentials, particularly their frequency dependence, should prove especially interesting for electrolytes such as magnesium sulfate for which structural relaxation effects have been recently postulated in order to account for the abnormal absorption of sea water.
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