Methyl-radical association studied by time-resolved mass spectroscopy

✍ Scribed by Frank K. Truby; James K. Rice

• Publisher: John Wiley and Sons
• Year: 1973
• Tongue: English
• Weight: 626 KB
• Volume: 5
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550050502

✦ Synopsis

Time-resolved mass spectroscopy has been utilized to study the kinetics of methylradical association. The rate coefficient for the association process was determined by following the time dependence of ethane formation after flash photolysis of CHJ in the presence of Nz. The net rate coefficient for the process 2CHa (+M) + C ~H B

(+M) has a high-pressure limit of (4.0 f 0.3) X lo-" cm3 molecule-' sec-' at 313°K. This rate coefficient has found to be insensitive to the third-body number densities for pressures ranging from 13 Torr down to below 0.5 Torr, indicating that the lifetime for dissociation of the intermediate C2H.* species is greater than 2 X see at 313OK for a gas pressure of 0.5 Torr.