Multiphoton laser-induced chemistry of trifluorobromomethane

• Published in: Chemical physics Vol. 41; no. 3; pp. 407 - 414
• Main Authors: Jalenak, W.A, Nogar, N.S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.08.1979
• ISSN: 0301-0104
• DOI: 10.1016/0301-0104(79)80045-2

The multiphoton induced chemistry of trifluorobromomethane (CF 3Br), using a pulsed TEA CO 2 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 C 2F 6, CF 4, CF 2Br 2, and Br 2. 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 CF 3Br pressure but to decrease with increasing added bath gas pressure (N 2 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 12CF 3Br 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 SF 6.