(E,2E) STUDIES ON CADMIUM AUTOIONIZING RESONANCES

We have measured (e, 2e) energy spectra in cadmium in the 4d(9)5s(2)5p j = 1 autoionizing region. The incident electron energy was 150 eV an d the momentum transfer was K almost-equal-to 0.2 a.u.. Differences in spectra taken at ejected-electron directions 180-degrees apart were d ue to interference terms arising from coherent excitation of J = 1 and J = 0, 2 autoionizing levels and J = 0, 2 continua. Ab initio spectro scopic calculations were carried out which enabled the extraction of r elative excitation magnitudes and phases from the experimental data. T he results are compared with PWBA calculations.