Daytime Reactions of 1,8‐Cineole in the Troposphere |
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| Authors: | Dr Antonio A Ceacero‐Vega Dr Bernabé Ballesteros Dr Iustinian Bejan Dr Ian Barnes Prof José Albaladejo |
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| Institution: | 1. Departamento de Química Física, Facultad de Químicas, Universidad de Castilla La Mancha, Avenida Camilo José Cela, s/n. 13071 Ciudad Real (Spain), Fax: (+34)?902‐204‐130;2. FB‐C Physical Chemistry Department, University of Wuppertal, Gaussstra?e 20, 42119 Wuppertal (Germany) |
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| Abstract: | Relative rate coefficients for the gas‐phase reaction of chlorine atoms (Cl) and hydroxyl radicals (OH) with 1,8‐cineole were determined by Fourier‐transform infrared (FTIR) spectroscopy between 285 and 313 K at atmospheric pressure. The temperature dependence of both reactions shows simple Arrhenius behaviour which can be represented by the following expressions (in units of cm3 molecule?1s?1): k(1,8‐cineole+OH)=(6.28±6.53)×10?8exp(?2549.3±155.7)/T] and k(1,8‐cineole+Cl)=(1.35±1.07)×10?10exp(?151.6±237.7)/T]. Major products of the titled reactions were identified by solid‐phase microextraction (SPME) coupled to a GC‐MS. Additionally, the first step of the reaction was theoretically studied by ab initio calculations and a reaction mechanism is proposed. |
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| Keywords: | atmospheric chemistry gas‐phase reactions IR spectroscopy kinetics terpenes |
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