Abstract
Absolute total cross sections (TCSs) for 0.6-370 eV electrons scattered by tetrafluoroethylene (C{sub 2}F{sub 4}) molecules have been measured using a linear transmission method. The TCS energy function for C{sub 2}F{sub 4} shows one very broad enhancement with the maximum value of 30x10{sup -20} m{sup 2} located around 30 eV. On the low-energy slope of the TCS curve some weak features near 2.8, 9.5, and 16 eV are discernible. Above 50 eV the present TCS agrees well with theoretical predictions. Absolute TCS for ethylene (C{sub 2}H{sub 4}) has also been measured and compared with the TCS for C{sub 2}F{sub 4}. Effect of substitution of fluorine atoms for hydrogen (perfluorination effect) was indicated and discussed. The reported TCS for C{sub 2}H{sub 4} is distinctly higher than experimental data existing so far.
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