Photochemical method for carbon isotopic enrichment

Details Photochemical method for carbon isotopic enrichment Photochemical method for carbon isotopic enrichment

1977-06-29

1978-10-17

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

204DIG11, B01J 110

Patent

active

041207670

ABSTRACT:
In the process of the invention an isotopic starting material comprising at least two isotopic forms of CF.sub.3 I and particularly a mixture of carbon-12 and carbon-13 isotopic species of CF.sub.3 I is selectively isotopically enriched by means of a laser-induced photochemical dissociation followed by chemical combination to form a compound, such as an ethylenically unsaturated compound other than CF.sub.3 I. The chemical combination takes the form of recombination of dissociation fragments or the combination of the CF.sub.3 radical with a scavenger compound. The separation is carried out by irradiating a gaseous mixture of the starting materials at a reduced pressure with laser radiation, until a significant enrichment in isotopic CF.sub.3 I is achieved. The wavelength of the radiation is selected so as to selectively excite one of the CF.sub.3 I isotopes, thereby causing the excited species to dissociate and form at least one chemical species other than CF.sub.3 I. The resulting mixture is enriched in selectively unexcited isotopic CF.sub.3 I which can be separated from the reaction product mixture by conventional techniques.

REFERENCES:
jones et al., J. Mol. Specter, 58, 125-141 (1975).
Petersen et al., Optics Communications, 17 (1976) pp. 259-263.

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