Rikagaku Kenkyusho

Shin-etsu Chemical Co., Ltd.

Kyoko Sugita

Shigeyoshi Arai

Shohei Isomura

Hayato Kaetsu

Takao Oshima

Tatsuhiko Honguu

Yo-ichi Ishikawa

Tetsuro Majima

Masatsugu Kamioka

Method for enrichment of oxygen 18 with a laser

An enrichment method of carbon 13 by use of the multistage laser irradiation. A mixture of CHClF.sub.2 and Br.sub.2 is used as a start substance. The mixture is irradiated with laser rays emitted from a carbon dioxide gas laser to obtain CBr.sub.2 F.sub.2 enriched with carbon 13. This CBr.sub.2 F.sub.2 enriched with carbon 13 is once more irradiated with laser rays emitted from a carbon dioxide gas laser to produce C.sub.2 Br.sub.2 F.sub.4 which is further enriched with carbon 13. Alternatively, the product CBr.sub.2 F.sub.2 of the first laser irradiation is once more irradiated together with O.sub.2 to produce COF.sub.2 which is further enriched with carbon 13.

Method of enriching the isotope carbon 13 by means of laser irradiation

Silicon isotopes are effectively separated by irradiating a polysilane compound or a fluoromosilane compound according to this invention with infrared laser rays. The polysilane compound is defined by the formula.

Working substances used in laser isotope separation and method of laser

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Tokyo, Japan

Kyoko Sugita