Dissociative Electron Capture by Benzene Derivatives

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Abstract
We have studied dissociative electron capture in a series of benzene derivatives using the combined swarm—beam method. The benzene derivatives C6H5Cl, o-C6H4Cl2, o-C6H4CH3Cl, C6H5Br, C6D5Br, and o-C6H4CH3Br, capture low-energy (including thermal) electrons dissociatively in a capture process which peaks at about 1 eV and yields only Cl− or Br− ions. The energies (in electron volts) at which the capture cross sections σc(ε) for the ∼1-eV processes peak and the values of σc(ε) (in cm2×1017) at peak energy for the above compounds are 0.86, 1.4; 0.36, 43; 1.1, 2.2; 0.84, 9.6; 0.8, 10.4; 0.95, 6 for C6H5Cl through o-C6H4CH3Br, respectively. The rates of capture at thermal electron energies are also given for each compound (but because of impurities are in question). For comparison with the benzene derivatives, C2H5Cl was also studied with the swarm—beam method. Beam data are also presented for dissociative electron capture by C6H5I, C6H5NO2, and o- and m-C6H4CH3NO2.