"Rate coefficients for the reaction of the hydroxyl radical with pyrrole"

DILLON, T. J.; DULITZ, K.; HOROWITZ, A.; MARIA EUGENIA TUCCERI; CROWLEY, J. N.

Vienna, Austria.

Conferencia; European Geosciences Union. General Assembly 2010.; 2010

EGU

The pulsed laser photolysis technique of radical generation, coupled to pulsed laser induced fluorescence detection of OH was used to measure absolute rate coefficients k1(P, T) for the title reaction, OH + C4H5Nàproducts (R1). Experiments were conducted in conditions of temperature and pressure representative of the Earth’s atmosphere, including for the first time at T < 298 K. Such conditions are frequently encountered in the field where (R1) is used to calibrate an instrument measuring OH reactivity. The accuracy of the data obtained was enhanced by on-line optical absorption measurements of [C4H5N] using a value of s(184,9nm) = (1.26 ±0.02)x10-17 cm2 molecule-1, which was determined in this work. Non-Arrhenius behaviour of k1(T) was observed, in line with results from the literature that were obtained at higher temperatures. Investigations of a possible pressure dependence in k1 are ongoing.