The ejected-electron spectrum of Al I autoionising transitions resulting from 20-500 eV electron impact excitation

The ejected-electron spectrum of aluminium vapour atoms has been observed at 75 degrees with respect to an incident electron beam of 20-500 eV kinetic energy. A total of 48 lines, in the region 0-6 eV, are reported corresponding to autoionisation processes in Al I. Where possible, assignments has been made based on available experimental data and hartree-Fock-type estimates. All the prominent features in the spectrum have been accounted for. In addition, the authors have tentatively identified the 2 D degrees and 2 P degrees terms of the 3p 3 configuration.