Abstract
Low pressure fast flow measurements of the emission from CF2(3B1) generated in mixtures of O with C2F4 in Ar and similar measurements using the air afterglow to follow oxygen atoms were made. From measurements of the exponential decay of air afterglow emission, it is concluded that the reaction proceeds through a C2F4O* intermediary. From the intensity and time evolution of the CF2(3B1) emission it is found, contrary to existing belief, that the yield of CF2(3B1) is small (less than 1%) and its radiative lifetime is much shorter than 1 s. The overall loss of O atoms at low C2F4 densities is characterized by a rate constant of 1.2×10−12 cm3 s−1. Both NO and O2 strongly quench the CF2(3B1) while quenching the precursor much less effectively. C2F4 quenches the precursor regenerating O, but does not quench CF2(3B1) significantly.
Published Version
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