An experimental study of low energy electrons attachment to CH2ClBr using ion mobility spectrometry

The rate constant of low-energy electron attachment to CH2ClBr was determined using atmospheric pressure nitrogen corona discharge electron attachment ion mobility spectrometry at ambient pressure and room temperature in the mean electron range between 0.35 and 0.69 eV. The rate constants are in the order of magnitude of similar to 10(-9) cm(3) molecule(-1) s(-1) and agree well with the reported value. Only one peak was observed in the production of low-energy electron attachment to CH2ClBr and it might be the overlap of hydrated anions Cl-(H2O)(n) and Br-(H2O)(m). In order to clarify the contribution of Cl and Br anions, acetic acid was utilized to react with the hydrated Cl/Br anions. The H2O molecules in the hydrated Cl/Br anions were substituted by CH3COOH molecules, and formed Cl-(CH3COOH)(p) and Br- (CH3COOH)(q), respectively. The contribution of hydrated Cl anions of low-energy electron attachment to CH2ClBr was found to be negligible, whereas the hydrated Br anions were the main product ions. (C) 2016 Elsevier B.V. All rights reserved.