Measurement of Hall Electromagnetic Force in Air

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Abstract
An experiment is reported in which an induced Hall electromagnetic force in air is measured in a shock tube. Agreement is found with theory for values of the product of the electron cyclotron frequency and the mean collision time for electrons over a gas temperature range of 3000° to 4200°K. The theory is based upon a mean collision time for electrons that is determined solely by electron-neutral particle collisions, and an Ohm's law that is valid for slightly ionized gases. The induced Hall electromagnetic force is theoretically independent of the electron concentration of the shock-heated air. The experiment thus provides a technique for determining the collision time that does not depend upon the establishment of equilibrium. Details of the time profile of the measured emf are explained qualitatively using an equivalent circuit.

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