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Title: Isotope separation by photoselective dissociative electron capture

Abstract

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.

Inventors:
 [1]
  1. Pleasanton, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
863166
Patent Number(s):
4110182
Assignee:
Dept. of Energy, Washington, DC (United States)
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; isotope; separation; photoselective; dissociative; electron; capture; method; separating; isotopes; based; dissociation; molecules; section; dependence; vibrational; molecule; molecular; source; material; irradiated; selectively; excite; containing; desired; predetermined; associated; therewith; energy; region; substantially; non-overlapping; ranges; lowest; vibration; subjected; electrons; corresponding; whereby; excited; preferentially; dissociate; negative; neutrals; product; neutral; depending; mechanism; particular; enriched; separated; reaction; conventional; means; specifically; 235; mixture; selective; excitation; followed; particular isotope; selective excitation; excited molecules; desired isotope; molecules containing; source material; isotope separation; energy range; associated therewith; selectively excite; separating isotopes; electron capture; selectively excited; energy ranges; conventional means; selective electron; dissociation product; isotopes based; URANIUM 235; ANIONS; URANIUM HEXAFLUORIDE; URANIUM PENTAFLUORIDE; ACTINIDE COMPOUNDS; ACTINIDE ISO; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; CHARGED PARTICLES; ENERGY-LEVEL TRANSITIONS; EVEN-ODD NUCLEI; FLUORIDES; FLUORINE COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; HEAVY NUCLEI; INTERNAL CONVERSION RADIOISOTOPES; IONS; ISOMERIC TRANSITION ISOTOPES; MINUTES LIVING RADIOISOTOPES; NUCLEI; RADIOISOTOPES; SEPARATION PROCESSES; SPONTANEOUS FISSION RADIOISOTOPES; URANIUM COMPOUNDS; URANIUM FLUORIDES; URANIUM ISOTOPES; /204/

Citation Formats

Stevens, Charles G. Isotope separation by photoselective dissociative electron capture. United States: N. p., 1978. Web.
Stevens, Charles G. Isotope separation by photoselective dissociative electron capture. United States.
Stevens, Charles G. Tue . "Isotope separation by photoselective dissociative electron capture". United States. https://www.osti.gov/servlets/purl/863166.
@article{osti_863166,
title = {Isotope separation by photoselective dissociative electron capture},
author = {Stevens, Charles G.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {8}
}

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