The excitation of autoionisation states of argon by electron impact

Electron impact excitation of the configurations 3s3p 6 4s, 4p, 3d and 5s in argon has been observed in the energy-loss mode over a range of scattering angles and impact energies. The energy-loss spectra have been analysed to obtain the variation with angle and energy of the line shape parameters and intensities for individual terms of these configurations. A number of accurate values of energy and width for terms of the 3s3p 6 4s, 4p, 3d, 5s, 4d and 6s configurations have also been derived.