The influence of surface oxidation on the electron tunnelling mechanism of microparticle charge reversal during a bouncing impact on a charged conductor

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Abstract
Carbonyl iron microspheres 0.1-2 mu m diameter, with velocities of 10-100 m s-1 and positive charges of (0.5-5)*10-15 C have been used for a comparative study of the charge reversal that occurs during a bouncing impact with negatively charged copper and stainless steel high-voltage electrodes that are either atomically clean or have approximately 30 AA and approximately >or approximately=150 AA surface oxide films. Argon ion etching and electron bombardment heating were available for in-situ surface cleaning, while an ellipsometric facility was used for characterizing electrode surfaces. Experimental results show that the efficiency of charge reversal is strongly dependent on both the thickness and electrical properties of surface oxide films.

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