Canadian Patents & Development Ltd.

Canadian Patents & Dev. Limited

Clive Willis

Peter A Hackett

Vincenzo Malatesta

Terrence J McKee

Michel Gauthier

A method of producing carbonyl fluoride by multiphoton decomposition of carbon dioxide-sulphur hexafluoride mixtures comprising irradiating gaseous carbon dioxide-sulphur hexafluoride mixtures in a reaction chamber at a pressure in the 10-50 Torr range with a laser beam at a frequency of about 944 wavenumbers and passing the material from the reaction chamber after irradiation through a chemical processing stage to obtain a carbonyl fluoride product.

Production of carbonyl fluoride

A method of producing carbon-13 using CF.sub.2 HCl as the feedstock (substrate) material in which the CF.sub.2 HCl is enriched up to a first level of C-13 by I.R. laser photodissociation and then to 90-99% C-13 by a second exchange process. In the preferred arrangement the second stage is a chemical exchange process.

Laser production of carbon-13 based on CF.sub.2 HCl

A method of upgrading a product containing a minor proportion of pre-vitamin d.sub.2 or pre-vitamin d.sub.3 and a major proportion of tachysterol comprising irradiating the product with laser light in the wavelength range 330-360 nanometers to obtain a product containing approximately 95% pre-vitamin -D.sub.2 or pre-vitamin -D.sub.3, and heating this product to convert the pre-vitamin -D.sub.2 or pre-vitamin -D.sub.3 to vitamin -D.sub.2 or vitamin -D.sub.3.

Method of production of vitamin-D

A rare-gas hydrogen-halide laser is improved by including or adding a predetermined quantity of a hydrogen donor additive to its gas mixture. The closed-off operation lifetime of lasers such as XeCl, KrCl, or XeBr are tripled by adding up to 0.05% hydrogen to the laser gas mixture.

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Ottawa, Canada

Clive Willis