(e,2e) studies on cadmium autoionizing resonances

We have measured (e,2e) energy spectra in cadmium in the 4d95s25p J = 1 autoionizing region. The incident electron energy was 150 eV and the momentum transfer was K ∼ 0.2 a.u. Differences in spectra taken at ejected-electron directions 180 apart were due to interference terms arising from coherent excitation of J = 1 and J = 0,2 autoionizing levels and J = 0,2 continua. Ab initio spectroscopic calculations were carried out which enabled the extraction of relative excitation magnitudes and phases from the experimental data. The results are compared with PWBA calculations. (orig.)