Electron-impact excitation of the (n-1)d9ns2np autoionizing states of cadmium (n=5) and zinc (n=4)

Electron-impact excitation of the 5 P-3(1) (12.062 eV) and 5 P-1(1) (12.810 eV) 4d(9)5s(2)5p autoionizing states of Cd has been experimentally investigated at incident electron energies (E-0) from 15 to 60 eV and scattering angles (0) up to 40degrees (at E-0 = 40, eV, theta = 2degrees-150degrees). The absolute differential cross sections (DCSs) at E-0 = 40 eV were determined through normalization to the optical oscillator strengths. These DCSs were extrapolated to 0degrees and 180degrees and numerically integrated to yield integral, momentum transfer and viscosity cross sections. Energy-loss spectra for Cd were recorded from I I to 18 eV, and 22 autoionizing states were identified at different impact energies. Electron-impact excitation of the 3d(9)4s(2)4p autoionizing states was observed in energy-loss spectra of Zn at E-0 = 20, 60, 80 and 100 eV (theta up to 10degrees). The DCSs for Cd could not be compared with other results, because there are no available data in literature. The autoionizing energy levels and line widths are in good agreement with existing experimental and calculated values.