Abstract: Isotopes of carbon are separated by irradiating an isotopic mixture of methyl fluoride with a laser tuned to an absorption and of one of the isotopes, reacting the isotopic mixture with atomic bromine, whereby the excited isotopic form of methyl fluoride reacts at a faster rate than the other form, and separating the products.

Abstract: Isotopes of hydrogen are separated by reacting a normal alkane, its deuterated form, atomic bromine, a deactivating gas, and a isotopically selective vibrational sensitizer gas selected from the class consisting of carbon dioxide, carbon monoxide, nitrogen, and mixtures thereof and separating the products which are enriched in deuterium.

Abstract: A laser system in which acetylene is mixed with a gaseous mixture of helium and carbon monoxide which has been vibrationally excited significantly populating the lower vibrational levels of the CO. The carbon monoxide will transfer its energy to the acetylene, populating the upper (01000) level to create laser radiation near 15.9 microns which may be operated in continuous-wave or pulsed modes. The laser cavity includes mirrors which are highly reflective at 16 microns but transparent to radiation at 8 microns or other well-known means which will operate in the same fashion.