IONIZATION OF U, UO, AND UO$sub 2$ BY ELECTRON IMPACT
Journal Article
·
· Journal of Chemical Physics (U.S.)
OSTI ID:4067747
The first ionization potential of uranium and the first appearance potentials of UO and UO/sub 2/ by electron impact were measured in a mass spectrometer, using the retarding potential difference (RPD) method. Small modifications of the RPD source are described. Crucibles of zirconium diboride were found to be preferable to tantalum crucibles for vaporization of uranium metal. Correction is made to the uranium appearance potential for thermally excited lowlying levels of the uranium atom, and for the several possible ionization paths. The ionization potential for uranium is 6.11 plus or minus 0.05 ev; for UO and UO/sub 2/ the appearance potentials are 5.72 plus or minus 0.06 ev and 5.5 plus or minus 0.1 ev. Ionization probability curves were determined for U and UO. (auth)
- Research Organization:
- Los Alamos Scientific Lab., N. Mex.
- NSA Number:
- NSA-18-016088
- OSTI ID:
- 4067747
- Report Number(s):
- LADC-6045; 0021-9606
- Journal Information:
- Journal of Chemical Physics (U.S.), Journal Name: Journal of Chemical Physics (U.S.) Vol. Vol: 40; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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