Media type: E-Article Title: Efficiency of Ionization in Hydrogen by Positive-Ion Impact At 7000 Volts Contributor: Gurney, Ronald W. imprint: American Physical Society (APS), 1928 Published in: Physical Review Language: English DOI: 10.1103/physrev.32.795 ISSN: 0031-899X Keywords: General Physics and Astronomy Origination: Footnote: