Abstract
Dilute mixtures (5-100 ppM) of C/sub 3/H/sub 8/ and of C/sub 3/D/sub 8/ in argon were pyrolyzed behind reflected shock waves at temperatures of 1200 to 1450/sup 0/K and total pressures of 2-3 atmospheres. Progress of the reaction was followed by analysis for H or D atoms using resonance absorption spectroscopy. Rate constants were determined as follows: C/sub 3/H/sub 8/ ..-->.. CH/sub 3/ + C/sub 2/H/sub 5/, k/sub 1/ = 2.5 x 10/sup 16/exp(-87,500/RT) s/sup -1/; C/sub 3/H/sub 8/ + Ar ..-->.. CH/sub 3/ + C/sub 2/H/sub 5/ + Ar, k/sub 1a/ = 2.6 x 10/sup 21/exp(-89,900/RT) mole/sup -1/ cm/sup 3/ s/sup -1/; where activation energies are in calories. Within experimental error, rate constants for the dissociation of C/sub 3/D/sub 8/ were the same. 2 figures, 2 tables.
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