Abstract
The reaction of C2H6+ with C2H6 was studied in a pulsed electron beam high ion source pressure mass spectrometer. Ethane at variable pressures in the 16—150 mTorr range in ~4 Torr hydrogen was used in experiments covering the temperature range from −145 to 400°C. Reaction: C2H6++C2H6 was found to have a rate constant k=10-6.6 T-1.5 whose magnitude decreased with temperature. The reaction proceeds via a (C4H12+)* intermediate, which at low temperature can be stabilized and becomes the major product. A very slow decrease of C4H12+ with time was observed at low temperature which was completely accounted for by an appearance and an increase of the trimer ion C6H18+. The two isomeric structures for C4H12+ are proposed in order to interpret the slow clustering reactions of C4H12+ with C2H6.
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