Positron and electron total cross sections for collisions with C2F6 and C2H3F3 molecules

The experimental total cross sections (TCSs) data for 0.7-600 eV positrons and 0.8-600 eV electrons colliding with hexafluoroethane (C2F6) and 1,1,1-trifluoroethane (C2H3F3) molecules are presented. These data are compared with the data of ethane (C2H6) measured previously. On the positron TCS data below 5 eV, the TCS curves are quite different from each other. For energies 7-25 eV, the data for these three kinds of molecules are comparable, though above 60 eV the C2F6 TCS data are roughly twice those of C2H6. The C2H3F3 TCS data have magnitudes almost midway between those of C2F6 and C2H6. The TCS curves for electrons show the same variation with energy as the positron data above 60 eV. In the low energy region, a few weak resonant peaks are observed in the C2F6 and C2H3F3 electron TCS curves. On the electron TCS data in the range 5.5-14 eV, the C2F6 data are lower than the C2H6 data