MULTI-PHOTON LASER-INDUCED CHEMISTRY OF TRIFLUOROBROMOMETHANE

The multiphoton induced chemistry of trifluorobromomethane (CF3Br), using a pulsed TEA CO2 laser operating in the R branch of the 00°1-02°0 transition, and the effects of pulse number, pressure, and exciting wavelength has been investigated. The photolysis products are C2F6, CF4, CF2Br2, and Br2. A reaction scheme is proposed to account for the observed products and their dependence on experimental conditions. The product yield are found to increase with CF3Br pressure but to decrease with increasing added bath gas pressure (N2 or NO). Varying the exciting wavelength caused a variation in product yields resulting in a spectrum similar to that for single photon absorption but red shifted by ≈10 cm-1. It was also observed that at the wavelength employed 12CF3Br is preferentially dissociated at pressures below 2 Torr. Finally a comparison is made between the results of this work and those done on other freons and SF6. © 1979.