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Ionization and Excitation of Radiation by Electron Impact in Mercury Vapor and Hydrogen

Ionization and Excitation of Radiation by Electron Impact in Mercury Vapor and Hydrogen THE IONIZATION AND EXCITATION OF RADIATION BY ELEC- TRON IMPACT IN MERCURY VAPOR AND HYDROGEN. BY BERGEN DAVIS AND F. S. GOUCHER. MERCURY VAPOR. Introduction.-It has recently been pointed out by Van der Bijll that the regular Lenard method for the direct determination of the ionizing potentials of different gases and vapors, in particular mercury vapor, is open to an objection which has not been considered by the experimenters hitherto employing this method. The objection is based on the fact that the positive charging up of the collecting electrode may as well be due to a photo-electric emission of electrons from it, under the action of the ultra-violet light emitted by the impacted atoms of the gas or vapor, as to the formation of positive ions by impact. This fact could not be determined from the curve shape since the number of radiating sources (intensity of radiation) and the positive ions produced would both be proportional to the number of impacts. The possibility that this is the case in mercury vapor at a voltage less than the true ionizing voltage is rendered highly probable, because of the nature of the experimental results obtained by Tate,2 Goucher,3 and McLennan http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

Ionization and Excitation of Radiation by Electron Impact in Mercury Vapor and Hydrogen

Davis, Bergen; Goucher., F. S
Physical Review , Volume 10 (2) – Aug 1, 1917
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Publisher
American Physical Society (APS)
Copyright
Copyright © 1917 The American Physical Society
ISSN
1536-6065
DOI
10.1103/PhysRev.10.101
Publisher site
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Abstract

THE IONIZATION AND EXCITATION OF RADIATION BY ELEC- TRON IMPACT IN MERCURY VAPOR AND HYDROGEN. BY BERGEN DAVIS AND F. S. GOUCHER. MERCURY VAPOR. Introduction.-It has recently been pointed out by Van der Bijll that the regular Lenard method for the direct determination of the ionizing potentials of different gases and vapors, in particular mercury vapor, is open to an objection which has not been considered by the experimenters hitherto employing this method. The objection is based on the fact that the positive charging up of the collecting electrode may as well be due to a photo-electric emission of electrons from it, under the action of the ultra-violet light emitted by the impacted atoms of the gas or vapor, as to the formation of positive ions by impact. This fact could not be determined from the curve shape since the number of radiating sources (intensity of radiation) and the positive ions produced would both be proportional to the number of impacts. The possibility that this is the case in mercury vapor at a voltage less than the true ionizing voltage is rendered highly probable, because of the nature of the experimental results obtained by Tate,2 Goucher,3 and McLennan

Journal

Physical Review – American Physical Society (APS)

Published: Aug 1, 1917

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