The competition between decomposition and collisional deactivation of the excited ethylene produced by the photolysis of C2H6 at 1470 Å has been studied. The pressure of C2H6 was varied in two series of photolyses at 25° and 310°C. Also, varying amounts of N2 and Ar were added to a fixed pressure of C2H6 in two series of photolyses at 310°C. The results are interpreted in terms of two excited states of ethylene, of which only one is capable of dissociating and has a dissociative lifetime of 6×10−10 sec (assuming unit efficiency for collisional stabilization). Nitrogen and argon are, respectively, 30% and 20% as effective as C2H6 in removing excess energy from excited ethylene.
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Hampson et al. (1965) studied this question.
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