Critical Ionization of Potentials of Uranium Hexafluoride Page: 1
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CUHTO* EN01HTCR WORKS
Tonnesaeo Eastrmn Corporation
CRITICAL 10K1ZAT10K POTENTIALS OP URANIUM HEXAFLUORIDE
The ©xtenaiva use of uranium hexafluoride in the Nler-typo mass
spectrometers, where the ionisation is produced by Slow oleotrons,
made a knowledge of the ionisation potentials of the various ions
desirable. This information was not available and work was
accordingly begun to eeouro such data. The first measurement
was made with a VOlA ion gauge and has been described in TKO
report CD-310. With this apparatus it was not possible to identify
the ionisation produota and it was presumed that the value reported
wee for tha UPgr ion. When time and equipment beoamo available,
the work «*t: oontlnued and the oritioal potentials of the eingly-
oharged ions determined*
Method of Measurement
The oritioal ionisation potentials wsrs determined with a con-
ventional Kisr- typo assay Instrument in which the emission
regulator unit had been modified to permit variation of tho
electron energy without disturbing the total emission from the
filament. The case and trap were operated at the same potential
so that, with application of tho proper corrections, the potential
drop from the tungsten filament to the oopper oase was the ionising
potential. The individual ions were identified in the conventional
speotrometrlo manner. Similar apparatus for determination of the
oritioal potentials with identification of the ions has boon used
frequently by other investigators.”)
The effeota of spaoe oharge, thermal excitation and seoondary
emission in the ionising region were evaluated by using mercury
as referenoo gas. The assumption was mads that the differenoe
between the measured potential and the accepted oritioal ionisation
potential could be assigned to these as sorted effeots and that this
XT) SmythV Prop. Roy*~6oo., l62, Z58 jI9^~)*"
(2) Bleakneyi fliys. Rev., 357 ^181 (1930) and others.
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Cameron, Angus Ewan, 1906- & White, J. R. Critical Ionization of Potentials of Uranium Hexafluoride, report, November 28, 1955; [Oak Ridge, Tennessee]. (https://digital.library.unt.edu/ark:/67531/metadc172835/m1/3/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.