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" Russell finds a principal ionization potential of 6-8o volts for the neutral atom, and 1y6 volts for the ionized atom. This is the first time that the ionization potential has been determined for a complex spark spectrum. In connection with his measurement... "
The Observatory - Page 198
1927
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Publications of the Astronomical Society of the Pacific, Volumes 37-38

Astronomical Society of the Pacific - 1925 - 870 pages
...Dr. Russell finds a principal ionization potential of 6.80 volts for the neutral atom, and 13.6 volts for the ionized atom. This is the first time that...investigation of the absorption properties of ozone and water-vapor. The constants of absorption of ozone in the region A3100 — A3300 have been measured,...
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The Observatory, Volume 50

1927 - 430 pages
...Dr. Russell finds a principal ionization potential of 6-8o volts for the neutral atom, and 1y6 volts for the ionized atom. This is the first time that...The constants of absorption of ozone in the region X 3100-X 3300 have been measured, together with the bolometric intensities of the lines in the ozone...
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Annual Report of the Director - Mount Wilson Observatory

Mount Wilson Observatory - 1917 - 616 pages
...normal state of the atom to that of the ion, is 6.80 volts. That for the ionized atom is 13.6 volts. This is the first time that the ionization potential...has been determined for a complex spark spectrum. Both are in good agreement with the values inferred from astrophysical data. Dr. Russell has also been...
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