Detection of 1CH2 Radicals in Hydrocarbon Pyrolysis Behind Shock Waves Using FM Spectroscopy

Abstract

The 1 CH 2 absorption coefficients were extracted from the numerical evaluation of the experiments as function of temperature. The following (fitted) expression α(T ) = 5.70 · 10 5 · exp(1.064 · 10 −3 (1690 − T/K)) cm 2 /mol reflects well the experimental results obtained for theb 1 B 1 (0, 14, 0)4 04 ←ã 1 A 1 (0, 0, 0)4 14 transition at 590.707 nm probed in this work.

Modeling nitrogen chemistry in combustion

“…However, the extrapolation to high temperatures is uncertain. Early high-temperature data from shock tubes [366] and ames [367] indicated that the reaction is not faster than 10 13 mol cm −3 s −1 at 2000 K, while more recent shock tube work of Rohrig et al [358] and Deppe and Wagner [368] suggested a fast rate even at high temperature.…”

“…The closed symbols denote measurements in the forward reaction while the open symbols denote data obtained from measurements of the reverse step, converted using the thermodynamic properties of the present work. Data for k 106 : Grebe and Homann [361], Bohland and Temps [362], Bohland et al [363], Boullart et al [364], Devriendt et al [365], Rohrig et al [358] and Deppe and Wagner [368]. Data derived from measurements of k 106b : Berman and Lin [369], Zabarnick et al [370], Becker et al [371], Brownsword et al [372].…”

Kinetic study of the OH + ethylene reaction using frequency‐modulated laser absorption spectroscopy

“…FM spectroscopy offers several advantages as a detection method for kinetics studies of small reactive intermediates such as CN, NH 2 , CH 2 , HCO, and more recently, HO 2 , C 2 H, and OH . Compared to more commonly applied laser‐induced fluorescence methods for the investigation of OH reactions, the absorption‐based FM methods have a simpler dependence of the sensitivity on pressure and temperature conditions.…”