## A New Method of Positive Ray Analysis and Its Application to the Measurement of the Probability and Critical Potentials for the Formation of Multiply Charged Ions in Hg Vapor by Electron Impact |

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30 volts amperes analyzer beam of electrons cm path Compton CRITICAL POTENTIALS cross ﬁeld current carried current densities current due curves of Fig Curves showing deﬂect different ions Doctor of Philosophy doubly charged ions e/m analysis curves effective cross-sectional area electric ﬁeld electron current electron per cm electron velocities ranging ﬁeld V2 ﬁlament ﬁnd FORMATION OF MULTIPLY function galvanometer Hg atom HG VAPOR Hippel IONIZATION IN MERCURY ionization potentials ionizing collision ions formed IONS IN HG kinetic theory value maximum mean free path measured the current mercury atom METHOD OF POSITIVE multiply charged ions number of ions number of positive peak Phys plate positive charges positive ion current positive ray analysis POTENTIALS IN MERCURY pressure at 0°C PROBABILITY AND CRITICAL Pyrex Relative numbers Saturation current single impact solenoid taken at various total area total number tron tube type of apparatus type of ion VAPOR BY ELECTRON volts per cm Voorhis