High-resolution ejected-electron spectrum of rubidium vapour autoionising levels excited by electrons with kinetic energies in the range 27 to 400 eV

A total of 66 autoionising states of Rb I have been observed between 15 and 21 eV excited-state energy, excitation being by electron impact at kinetic energies of 27, 40, 100 and 400 eV. Of the observed states, 40 have been reported in ultraviolet absorption experiments. The remaining 26 states do not appear in any previous data. Spectra are presented for electrons ejected at an angle of 75 degrees with respect to the incident electron beam.