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Excerpt from The Theory of Ionization of Gases by Collision After studying the changes which take place in the conductivity of gases through which ions are passing under various conditions, I was led to propose the theory of ionization by collision to explain the development of currents in gases. The accuracy of the theory has been established by a large number of experiments specially arranged to measure conductivities which could be compared with the values obtained from theoretical considerations. The researches have brought to light the fact that ionization by collision takes place when comparatively small potential differences are established between electrodes in a gas at a suitable pressure, so that considerable multiplication of the ions may be obtained by this process with forty or fifty volts, and consequently with comparatively small velocities of the ions. This is in marked contrast with the previously known cases of ionization produced by the motion of ions through a gas, where the velocity is always very high, sometimes approaching that of light. Such, for instance, is the case for the negative particles emitted by radioactive substances, or for the particles composing the cathode rays and the Lenard rays when the ions move with velocities that are acquired under the action of some thousands of volts. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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Provides a comprehensive review and usable problem-solving techniques for aerospace engineering plasma applications.