Electron-chlorine molecule total ionisation and electron attachment cross sections

Cross sections for absolute total ionisation between 10 and 100 eV, dissociative attachment between 0 and 11 eV, and negative-ion formation between 11 and 100 eV, of the chlorine molecule by electron collision have been measured by using a parallel-plate-type interaction chamber. The maximum of the ionisation curve was found to be at 80 eV with a value of 5.58*10-20 m2. Four dissociative attachment processes peaking at 0.0, 2.50, 5.75 and 9.7 eV, with cross sections of 201.6, 2.84, 4.84 and 0.39*10-22 m2, respectively, were detected. Negative-ion formation cross sections with maxima at 20 and 79 eV, and values of 2.58 and 4.28*10-22 m2, respectively, were found. The relative error, except for the first attachment maximum, is +or-0.20.