11. Thermal Electrons and Environmental Pollutants

  1. E. C. M. Chen and
  2. E. S. D. Chen

Published Online: 19 APR 2004

DOI: 10.1002/0471659894.ch11

The Electron Capture Detector and the Study of Reactions with Thermal Electrons

The Electron Capture Detector and the Study of Reactions with Thermal Electrons

How to Cite

Chen, E. C. M. and Chen, E. S. D. (2004) Thermal Electrons and Environmental Pollutants, in The Electron Capture Detector and the Study of Reactions with Thermal Electrons, John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/0471659894.ch11

Publication History

  1. Published Online: 19 APR 2004
  2. Published Print: 16 APR 2004

ISBN Information

Print ISBN: 9780471326229

Online ISBN: 9780471659891

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Keywords:

  • chloromethane anions;
  • halogenated aromatic anions;
  • freon substitutes;
  • chlorinated biphenyls;
  • fluorocycloalkanes;
  • fluorobenzenes;
  • chlorobenzenes

Summary

This chapter evaluates the available data and presents new data for electron reactions with environmentally significant molecules. The electron affinities of the alkyl-halides including the freons and newer coolants are evaluated. The Ea of c-CF3C6F11 and c-CF3C5F9 and the EDEA are determined from atmospheric pressure negative ion mass spectra. Activation energies and bond dissociation energies are determined from molar ECD responses at a single temperature. Electron affinities and activation energies for electron attachment to freon substitutes are obtained by analyzing ECD responses measured as a function of temperature published in 1997. The two state model gives new results that are compared with the original single state interpretation. The electron affinities of the chloroethylenes and chlorobenzenes were determined using the ECD and those of C6F6,C6F5X,C6HCl5 and C6Cl6 using TCT. The only Ea for the polychlorinated naphthalenes and chlorinated biphenyls and the complete set of Ea for the chlorobenzenes were obtained from reduction potentials in aprotic solvents. The ECD data for fluorobenzenes and chlorobenzenes are analyzed and evaluated. The electron affinities of the halogenated benzenes are calculated using CURES-EC. Unpublished ECD data for trifluoromethylhalobenzenes are analyzed to obtain Ea. Morse potential energy curves for CCl4 and CH2Cl2 and C6F5X(−) are calculated from electron affinities, electron impact data and dissociation energies.