Coherent excitation of cadmium J=0,1,2 autoionizing levels by electron impact

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We have measured (e,2e) energy spectra in cadmium for the 4d95s25p J=1 autoionizing region. The ejected-electron energy range investigated was from 2.6 to 4.8 eV with an incident electron energy of 150 eV and a scattering angle of 3°. Small differences were found in spectra taken at ejected-electron directions 180°apart. We ascribe these differences to interference terms arising from coherent excitation of the J=1 and overlapping 5pnp J=0,2 autoionizing levels. A calculation of these effects is presented that agrees quite well with the experimental data. We obtain experimental excitation amplitude ratios and assign a previously undetected autoionizing level to 5p6p 3D2. © 1991 The American Physical Society.

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Physical Review A

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