Vacuum Ultraviolet Photochemistry of Fluoroethene and 1,1-Difluoroethene

Article abstract of DOI:10.1021/j150653a032

Products from the broad-band vacuum ultraviolet photolysis of CH2CHF and CH2CF2 were collected by using a novel gas collection technique and analyzed by using gas chromatography.The primary route of decay for both parents is through α-β elimination of HF.Primary branching ratios for HF elimination, F atom ejection, and HH elimination from CH2CHF were determined: 0.82, 0.13, and 0.05, respectively.The technique does not permit detection of single H atom ejection.The ratio of (C2F2H3) <*> stabilization by He vs. decomposition, formed by the addition of F to CH2CHF, is 0.029 +/- 0.004 torr^-1.The lifetime of the excited complex is approximately a factor of 5 longer relative to other related systems.A less detailed study of excited-CH2CF2 decay indicates similar trends.