Current Oscillation and Potential Oscillation in Semiconductors with a Dombbell-Shaped Structure

Abstract

oxide smoke. Although the latter did not possess geometrical regularity, as did the systems devised by Mr. Melmore, the general similarity of cham structure was remarkable.(1) LOWE and LUCAS.(2) MELMORE.Aggregation of the individual particles composing an aerosol is a phenomenon of primary importance in the aging of the aerosol. The influence of electrification and foreign vapours on the aggregation process has been investigated Results indicate that electrification amounting to a few electron charges per particle has little effect on the rate of aggregation, but has a decided influence on the shapes of the aggregates. In the case of aerosols whose particles have a significant vapour pressure, certain substances which lower this vapour pressure have been found to increase the rate of aggregation, presumably by reducing the vapour cushion surroundmg the pariicles. When the particles are readily soluble in a substance whose vapour is present, the rate of aggregation also appears to be increased because of reduction of the vapour layer about the particles.