DOUBLY DIFFERENTIAL CROSS-SECTIONS FOR THE IONIZATION OF THE SF6 MOLECULE BY ELECTRON-IMPACT

The partial doubly differential cross sections (PDDCS) for the ions SF 5+, SF4+, SF3+, SF2+,(SF+. SF4++), S+, SF5++, SF3++ and SF2++ resultin g from the dissociative ionization of the SF6 molecule by electron imp act employing the ejected-electron and produced-ion coincidence techni que have been measured. Measurements have been made for incident elect ron energies of 100 and 200 eV and for ejected electron energies of 30 , 50, 65, 100 and 150 eV. The angular range for the detection of the e jected electron is between 10 degrees and 120 degrees. No trace of SF6 + ions is found at any energy used. No previous data or theoretical pr edictions exist with which to make comparisons.