The effect of a buffer (acceptor) gas on the yield of products in isotropically selective IR multiple-photon dissociation of CF3I molecules in a pulse gasdynamic flow

The results of investigations of isotopically selective IR multiple-photon dissociation (MPD) of CF3I molecules in a pulse gasdynamic flow are reporte d. To reduce the loss of CF3 radicals produced by dissociation of CF3I mole cules and increase the yield of produces, we suggested to introduce a low-p ressure(acceptor) gas in the chamber in which the molecular flow is formed. The effect of buffer (acceptor) gas (H-2, D-2, and O-2) on the yield of pr oducts and of CF3I molecules building up in the chamber on the yield of C2F 6 and its enrichment in the C-13 isotope is studied. It is shown that the u se of a low-pressure buffer (acceptor) gas in the chamber can significantly increase the yield of products. The effect of a radical scavenger (oxygen) on the yield of products is most prominent at low concentrations of the CF 3 radicals formed in the flow when the C2F6 yield is very small. In this ca se COF2 molecules formed by the reaction of CF3 radicals with oxygen are mo st abundant in the products.