LOW-ENERGY-ELECTRON SCATTERING BY CF3CL, CF2CL2, CFCL3 AND CCL4

We report the results of electron transmission experiments in the chlo rofluoromethanes and CCl4 in the energy range from less than 10 meV to a few hundred meV, using a magnetically confined electron beam, gener ated from a high resolution, synchrotron photoionization source on Sup erACO, LURE. Scattering spectra show evidence of electron attachment, Ramsauer-Townsend effects, and pure rotational and rovibrational inela stic scattering. For CF3Cl and CF2Cl2 we analyse the inelastic scatter ing phenomena in terms of the first Born approximation, showing that t his gives a good fit to the form of the variation of the pure rotation ally inelastic cross section with electron kinetic energy.