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Title: Isotope separation by photoselective dissociative electron capture

Abstract

Disclosed is a method of separating isotopes based on photoselective electron capture dissociation of molecules having an electron capture cross section dependence on the vibrational state of the molecule. A molecular isotope source material is irradiated to selectively excite those molecules containing a desired isotope to a predetermined vibrational state having associated therewith an electron capture energy region substantially non-overlapping with the electron capture energy ranges associated with the lowest vibration states of the molecules. The isotope source is also subjected to electrons having an energy corresponding to the non-overlapping electron capture region whereby the selectively excited molecules preferentially capture electrons and dissociate into negative ions and neutrals. The desired isotope may be in the negative ion product or in the neutral product depending upon the mechanism of dissociation of the particular isotope source used. The dissociation product enriched in the desired isotope is then separated from the reaction system by conventional means. Specifically, [sup 235]UF[sub 6] is separated from a UF[sub 6] mixture by selective excitation followed by dissociative electron capture into [sup 235]UF[sub 5]- and F. 2 figs.

Inventors:
Publication Date:
OSTI Identifier:
6962812
Patent Number(s):
US 4110182; A
Application Number:
PPN: US 5-696997
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; EDB-94-158389
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Patent
Resource Relation:
Patent File Date: 17 Jun 1976
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; URANIUM 235; ISOTOPE SEPARATION; ANIONS; ELECTRON CAPTURE; EXCITATION; URANIUM HEXAFLUORIDE; URANIUM PENTAFLUORIDE; ACTINIDE COMPOUNDS; ACTINIDE ISO; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; CAPTURE; CHARGED PARTICLES; ENERGY-LEVEL TRANSITIONS; EVEN-ODD NUCLEI; FLUORIDES; FLUORINE COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; HEAVY NUCLEI; INTERNAL CONVERSION RADIOISOTOPES; IONS; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MINUTES LIVING RADIOISOTOPES; NUCLEI; RADIOISOTOPES; SEPARATION PROCESSES; SPONTANEOUS FISSION RADIOISOTOPES; URANIUM COMPOUNDS; URANIUM FLUORIDES; URANIUM ISOTOPES; 050500* - Nuclear Fuels- Uranium Enrichment

Citation Formats

Stevens, C.G. Isotope separation by photoselective dissociative electron capture. United States: N. p., 1978. Web.
Stevens, C.G. Isotope separation by photoselective dissociative electron capture. United States.
Stevens, C.G. 1978. "Isotope separation by photoselective dissociative electron capture". United States. doi:.
@article{osti_6962812,
title = {Isotope separation by photoselective dissociative electron capture},
author = {Stevens, C.G.},
abstractNote = {Disclosed is a method of separating isotopes based on photoselective electron capture dissociation of molecules having an electron capture cross section dependence on the vibrational state of the molecule. A molecular isotope source material is irradiated to selectively excite those molecules containing a desired isotope to a predetermined vibrational state having associated therewith an electron capture energy region substantially non-overlapping with the electron capture energy ranges associated with the lowest vibration states of the molecules. The isotope source is also subjected to electrons having an energy corresponding to the non-overlapping electron capture region whereby the selectively excited molecules preferentially capture electrons and dissociate into negative ions and neutrals. The desired isotope may be in the negative ion product or in the neutral product depending upon the mechanism of dissociation of the particular isotope source used. The dissociation product enriched in the desired isotope is then separated from the reaction system by conventional means. Specifically, [sup 235]UF[sub 6] is separated from a UF[sub 6] mixture by selective excitation followed by dissociative electron capture into [sup 235]UF[sub 5]- and F. 2 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1978,
month = 8
}
  • A method of separating isotopes based on photoselective electron capture dissociation of molecules having an electron capture cross section dependence on the vibrational state of the molecule. A molecular isotope source material is irradiated to selectively excite those molecules containing a desired isotope to a predetermined vibrational state having associated therewith an electron capture energy region substantially non-overlapping with the electron capture energy ranges associated with the lowest vibration states of the molecules. The isotope source is also subjected to electrons having an energy corresponding to the non-overlapping electron capture region whereby the selectively excited molecules preferentially capture electrons andmore » dissociate into negative ions and neutrals. The desired isotope may be in the negative ion product or in the neutral product depending upon the mechanism of dissociation of the particular isotope source used. The dissociation product enriched in the desired isotope is then separated from the reaction system by conventional means. Specifically, .sup.235 UF.sub.6 is separated from a UF.sub.6 mixture by selective excitation followed by dissociative electron capture into .sup.235 UF.sub.5 - and F.« less
  • A method of separating isotopes based on photoselective electron capture dissociation of molecules having an electron capture cross section dependence on the vibrational state of the molecule is described. A molecular isotope source material is irradiated to selectively excite those molecules containing a desired isotope to a predetermined vibrational state having associated therewith an electron capture energy region substantially non-overlapping with the electron capture energy ranges associated with the lowest vibration states of the molecules. The isotope source is also subjected to electrons having an energy corresponding to the non-overlapping electron capture region whereby the selectively excited molecules preferentially capturemore » electrons and dissociate into negative ions and neutrals. The desired isotope may be in the negative ion product or in the neutral product depending upon the mechanism of dissociation of the particular isotope source used. The dissociation product enriched in the desired isotope is then separated from the reaction system by conventional means. Specifically, /sup 235/UF/sub 6/ is separated from a UF/sub 6/ mixture by selective excitation followed by dissociative electron capture into /sup 235/UF/sub 5//sup -/ and F.« less
  • A description of work performed on isotopically selective, photo-enhanced production of SF/sup -//sub 5/ from SF/sub 6/ is included. The primary task under the present contract was the construction of a second-generation experimental apparatus for the study of the simultaneous interaction of electrons, photons, and molecules. The collinear electron and laser beam arrangement employed previously has been retained, but a new electron gun design has been adopted which avoids the troublesome interaction of the laser beam with the electron gun filament. The system has been designed for maximum compatibility with aggressive gases such as UF/sub 6/. Details of the designmore » and construction of this system are given. Proposals for future work include work on SF/sub 6/ and UF/sub 6/.« less