Details

Autor(en) / Beteiligte

• Dilger, Herbert
• Schwager, Martina
• Tregenna-Piggott, Philip L. W
• Roduner, Emil
• Reid, Ivan D
• Arseneau, Donald J
• Pan, James J
• Senba, Masayoshi
• Shelley, Mee
• Fleming, Donald G

Titel

Addition Kinetics and Spin Exchange in the Gas Phase Reaction of the Ethyl Radical with Oxygen

Ist Teil von

• Journal of physical chemistry (1952), 1996-04, Vol.100 (16), p.6561-6571

Ort / Verlag

American Chemical Society

Erscheinungsjahr

1996

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The kinetics of the addition reaction of O2 to the ethyl radical has been investigated as a function of temperature (259−425 K) and pressure (1.5−60 bar) using the muon spin relaxation technique in longitudinal magnetic fields. Within this temperature range at 1.5 bar, the chemical reaction is represented by an Arrhenius rate law with an activation energy of −4.4(4) kJ mol-1 and an apparent frequency factor of 1.3(2) × 10-12 cm3 molecule-1 s-1. The high-pressure limit of the rate constant at 294 K amounts to = 8.7(8) × 10-12 cm3 molecule-1 s-1. Within error, this limit has been reached at 1.5 bar. The rate coefficient for spin exchange, k ex = 2.8(2) × 10-10 cm3 molecule-1 s-1, is collision controlled. The results for k ch agree well with experimental literature values, but the temperature dependence is more pronounced than that predicted on the basis of a RRKM extrapolation from low-pressure data. The theoretical basis for the analysis of experimental data is given, and the results are discussed.