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The present study reports temperature dependent rate constants  k  1  for the title reaction across the temperature range 213 to 293 K obtained in a Knudsen flow reactor equipped with an external free radical source based on the reaction C 2 H 5 I + H •  → C 2 H 5  •  + HI and single VUV-photon ionization mass spectrometry using Lyman- α  radiation of 10.2 eV. Combined with previously obtained high-temperature data of  k  1  in the range 298–623 K using the identical experimental equipment and based on the kinetics of C 2 H 5  •  disappearance with increasing HI concentration we arrive at the following temperature dependence best described by a three-parameter fit to the combined data set:  k  1  = (1.89 ± 1.19)10 −13 ( T /298) 2.92±0.51  exp ((3570 ± 1500)/ RT ),  R  = 8.314 J mol  – 1  K  – 1  in the range 213–623 K. The present results confirm the general properties of kinetic data obtained either in static or Knudsen flow reactors and do nothing to reconcile the significant body of data obtained in laminar flow reactors using photolytic free radical generation and suitable free radical precursors. The resulting rate constant for wall-catalyzed disappearance of ethyl radical across the full temperature range is discussed.

The Kinetics of the Reaction C 2 H 5 • + HI → C 2 H 6 + I • over an Extended Temperature Range (213–623 K): Experiment and Modeling

The Kinetics of the Reaction C 2 H 5 •  + HI → C 2 H 6  + I • over an Extended Temperature Range (213–623 K): Experiment and Modeling