Pierre Barchewitz

Spectrographie Infrarouge à Haute Résolution: Application à I’Étude de Quelques Molécules Simples

Two high-resolution spectrographs, running between 1.2 μ and 3 μ, are described. At 6000 cm−1 the resolving power attained is 0.09 cm−1 for the Czerny type and 0.06 cm−1 for the Fastie–Ebert type. These spectrographs are fitted with a calibration device which makes it possible to record simultaneously the studied absorption spectrum and the calibration interference peaks. The latter are produced by a Perot–Fabry etalon, the fringes of which, at infinity, are projected on the entrance slit of the spectrograph. They allow localization of the absorption lines relative to standard lines. A few results obtained with gaseous HI, NO, and N2O are listed.

Modele theorique de separation isotopique par laser

Abstract The energy transfer reactions involved in the isotope separation of molecular mixtures by selective two-step photodissociation are discussed. Results of computer experiments show the validity of the theoretical model. Isotope enrichment may he predicted.